Don't leak timers

When in the rollback loop, a timer was created, but if the context is finished, then the timer's channel would leak.

In addition, the function said it was doing exponential backoff (presumably from 0 to 512 seconds), but the arguments to the `Exp()` function were reversed, so it was doing quadratic backoff from 0 to 81 seconds.

Also, there was no test for the rollback function, so one was added.

go.mod

@@ -12,7 +12,7 @@ require (
 	github.com/hashicorp/go-secure-stdlib/parseutil v0.1.7
 	github.com/hashicorp/go-secure-stdlib/strutil v0.1.2
 	github.com/hashicorp/vault/api v1.9.2
-	github.com/hashicorp/vault/sdk v0.9.2
+	github.com/hashicorp/vault/sdk v0.11.1-0.20240325190132-c20eae3e84c5
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/ory/dockertest/v3 v3.10.0
 	github.com/stretchr/testify v1.8.4
@@ -30,64 +30,68 @@ require (
 	github.com/containerd/continuity v0.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/docker/cli v20.10.17+incompatible // indirect
-	github.com/docker/docker v23.0.4+incompatible // indirect
+	github.com/docker/distribution v2.8.2+incompatible // indirect
+	github.com/docker/docker v24.0.7+incompatible // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
 	github.com/evanphx/json-patch/v5 v5.6.0 // indirect
-	github.com/fatih/color v1.13.0 // indirect
+	github.com/fatih/color v1.14.1 // indirect
 	github.com/go-asn1-ber/asn1-ber v1.5.4 // indirect
 	github.com/go-jose/go-jose/v3 v3.0.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
+	github.com/hashicorp/cap/ldap v0.0.0-20230914221201-c4eecc7e31f7 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
 	github.com/hashicorp/go-kms-wrapping/entropy/v2 v2.0.0 // indirect
 	github.com/hashicorp/go-kms-wrapping/v2 v2.0.8 // indirect
-	github.com/hashicorp/go-plugin v1.4.8 // indirect
+	github.com/hashicorp/go-plugin v1.6.0 // indirect
 	github.com/hashicorp/go-retryablehttp v0.7.1 // indirect
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
 	github.com/hashicorp/go-secure-stdlib/mlock v0.1.2 // indirect
+	github.com/hashicorp/go-secure-stdlib/plugincontainer v0.3.0 // indirect
 	github.com/hashicorp/go-secure-stdlib/tlsutil v0.1.2 // indirect
 	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
 	github.com/hashicorp/go-uuid v1.0.3 // indirect
 	github.com/hashicorp/go-version v1.6.0 // indirect
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
 	github.com/hashicorp/hcl v1.0.1-vault-5 // indirect
-	github.com/hashicorp/yamux v0.0.0-20211028200310-0bc27b27de87 // indirect
+	github.com/hashicorp/yamux v0.1.1 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
+	github.com/joshlf/go-acl v0.0.0-20200411065538-eae00ae38531 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.17 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-testing-interface v1.14.1 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
-	github.com/moby/term v0.0.0-20221205130635-1aeaba878587 // indirect
+	github.com/moby/term v0.5.0 // indirect
 	github.com/oklog/run v1.1.0 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.0-rc2.0.20221005185240-3a7f492d3f1b // indirect
-	github.com/opencontainers/runc v1.1.6 // indirect
+	github.com/opencontainers/runc v1.1.12 // indirect
 	github.com/pierrec/lz4 v2.6.1+incompatible // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/ryanuber/go-glob v1.0.0 // indirect
-	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
 	github.com/stretchr/objx v0.5.0 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	go.uber.org/atomic v1.9.0 // indirect
-	golang.org/x/crypto v0.17.0 // indirect
-	golang.org/x/mod v0.9.0 // indirect
-	golang.org/x/net v0.17.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
-	golang.org/x/time v0.0.0-20220411224347-583f2d630306 // indirect
-	golang.org/x/tools v0.7.0 // indirect
-	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
-	google.golang.org/grpc v1.56.3 // indirect
-	google.golang.org/protobuf v1.30.0 // indirect
+	golang.org/x/crypto v0.20.0 // indirect
+	golang.org/x/mod v0.11.0 // indirect
+	golang.org/x/net v0.21.0 // indirect
+	golang.org/x/sys v0.17.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	golang.org/x/tools v0.10.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20231030173426-d783a09b4405 // indirect
+	google.golang.org/grpc v1.60.1 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
 	gopkg.in/yaml.v2 v2.3.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )