Consume version 0.19.0 of conjur-authn-k8s-client

This version introduces some changes that we can benefit from, especially these:
- Errors in the certificate injection process on login are now printed to the client logs.
  [cyberark/conjur-authn-k8s-client#/170](cyberark/conjur-authn-k8s-client#170)
- When authentication fails, the exponential backoff retry is correctly reset so
  that it will continue to attempt to authenticate until backoff is exhausted.
  [cyberark/conjur-authn-k8s-client#158](cyberark/conjur-authn-k8s-client#158)
- Wait slightly for the client certificate file to exist after login before
  raising an error.
  [cyberark/conjur-authn-k8s-client#119](cyberark/conjur-authn-k8s-client#119)

CHANGELOG.md

@@ -5,6 +5,11 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- Update k8s authenticator client version to 
+  [0.19.0](https://github.com/cyberark/conjur-authn-k8s-client/blob/master/CHANGELOG.md#0190---2020-10-08),
+  which adds some fixes around cert injection failure (see also changes in 
+  [0.18.1](https://github.com/cyberark/conjur-authn-k8s-client/blob/master/CHANGELOG.md#0181---2020-09-13)).
 
 ### Added
 - The `vault` provider now supports loading secrets from the KV Version 2 secret

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/codegangsta/cli v1.20.0
 	github.com/containerd/containerd v1.3.2 // indirect
 	github.com/cyberark/conjur-api-go v0.5.2
-	github.com/cyberark/conjur-authn-k8s-client v0.16.1
+	github.com/cyberark/conjur-authn-k8s-client v0.19.0
 	github.com/cyberark/summon v0.7.0
 	github.com/denisenkom/go-mssqldb v0.0.0-20191001013358-cfbb681360f0
 	github.com/docker/distribution v2.7.1+incompatible // indirect

go.sum

@@ -29,9 +29,7 @@ github.com/containerd/containerd v1.3.2 h1:ForxmXkA6tPIvffbrDAcPUIB32QgXkt2XFj+F
 github.com/containerd/containerd v1.3.2/go.mod h1:bC6axHOhabU15QhwfG7w5PipXdVtMXFTttgp+kVtyUA=
 github.com/cyberark/conjur-api-go v0.5.2 h1:8ntk07YNRz5bBwjNXkDEAPR70Yr+J2MN8NGlkhaMC3k=
 github.com/cyberark/conjur-api-go v0.5.2/go.mod h1:hwaReWirzgKor+JtH6vbwZaASDXulvd0SzGCloC5uOc=
-github.com/cyberark/conjur-authn-k8s-client v0.13.0/go.mod h1:JTeGIeRO59J7mMEc5yF6FPtk1QnaAzs4GyZa4WldqZc=
-github.com/cyberark/conjur-authn-k8s-client v0.16.1 h1:tiYIUYuBr578BCYlx+mbPiE4dWi+NsCu6Dy9cSRv4/M=
-github.com/cyberark/conjur-authn-k8s-client v0.16.1/go.mod h1:qacUJXCppU1Rg/C+br9B1jBitTq4yG04oc4a+cfI200=
+github.com/cyberark/conjur-authn-k8s-client v0.19.0/go.mod h1:qacUJXCppU1Rg/C+br9B1jBitTq4yG04oc4a+cfI200=
 github.com/cyberark/secretless-broker v1.4.1-0.20191211191712-251c5ec034af/go.mod h1:+GueI3WCJL5gDYaYa38ZokAR8ceEyCVet7MkuZyjf80=
 github.com/cyberark/summon v0.7.0 h1:eBjyNzpJEeFb7BFcOgidM6S/UbEsN7LGSFeQE7szPsk=
 github.com/cyberark/summon v0.7.0/go.mod h1:S7grcxHeUxfL1vRTQUyq9jGK8yG6V/tSlLPQ6tHRO4k=