provider/github: Randomize acceptance tests

[radeksimko]

This is to get rid of dependency on a static repository name test-repo and make acceptance tests work in any organisation without extra manual setup.

Test plan

make testacc TEST=./builtin/providers/github TESTARGS='-run=TestAccGithub'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/05/13 11:13:51 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/github -v -run=TestAccGithub -timeout 120m
=== RUN   TestAccGithubBranchProtection_basic
--- FAIL: TestAccGithubBranchProtection_basic (6.76s)
	testing.go:280: Step 0 error: Error applying: 1 error(s) occurred:

		* github_branch_protection.master: 1 error(s) occurred:

		* github_branch_protection.master: PUT https://api.github.com/repos/terraformtesting/tf-acc-test-branch-prot-hwut9/branches/master/protection: 422 Invalid request.

		"enforce_admins" wasn't supplied. []
=== RUN   TestAccGithubBranchProtection_importBasic
--- FAIL: TestAccGithubBranchProtection_importBasic (1.95s)
	testing.go:280: Step 0 error: Error applying: 1 error(s) occurred:

		* github_branch_protection.master: 1 error(s) occurred:

		* github_branch_protection.master: PUT https://api.github.com/repos/terraformtesting/cp9by/branches/master/protection: 422 Invalid request.

		"enforce_admins" wasn't supplied. []
=== RUN   TestAccGithubIssueLabel_basic
--- PASS: TestAccGithubIssueLabel_basic (4.88s)
=== RUN   TestAccGithubIssueLabel_existingLabel
--- PASS: TestAccGithubIssueLabel_existingLabel (3.38s)
=== RUN   TestAccGithubIssueLabel_importBasic
--- PASS: TestAccGithubIssueLabel_importBasic (3.38s)
=== RUN   TestAccGithubMembership_basic
--- PASS: TestAccGithubMembership_basic (1.74s)
=== RUN   TestAccGithubMembership_importBasic
--- PASS: TestAccGithubMembership_importBasic (1.64s)
=== RUN   TestAccGithubOrganizationWebhook_basic
--- PASS: TestAccGithubOrganizationWebhook_basic (3.07s)
=== RUN   TestAccGithubRepositoryCollaborator_basic
--- PASS: TestAccGithubRepositoryCollaborator_basic (3.58s)
=== RUN   TestAccGithubRepositoryCollaborator_importBasic
--- PASS: TestAccGithubRepositoryCollaborator_importBasic (3.38s)
=== RUN   TestAccGithubRepository_basic
--- PASS: TestAccGithubRepository_basic (3.07s)
=== RUN   TestAccGithubRepository_importBasic
--- PASS: TestAccGithubRepository_importBasic (2.15s)
=== RUN   TestAccGithubRepositoryWebhook_basic
--- PASS: TestAccGithubRepositoryWebhook_basic (4.45s)
=== RUN   TestAccGithubTeamMembership_basic
--- PASS: TestAccGithubTeamMembership_basic (5.48s)
=== RUN   TestAccGithubTeamMembership_importBasic
--- PASS: TestAccGithubTeamMembership_importBasic (2.50s)
=== RUN   TestAccGithubTeamRepository_basic
--- PASS: TestAccGithubTeamRepository_basic (4.50s)
=== RUN   TestAccGithubTeamRepository_importBasic
--- PASS: TestAccGithubTeamRepository_importBasic (2.83s)
=== RUN   TestAccGithubTeam_basic
--- PASS: TestAccGithubTeam_basic (4.10s)
=== RUN   TestAccGithubTeam_importBasic
--- PASS: TestAccGithubTeam_importBasic (1.42s)
=== RUN   TestAccGithubUtilRole_validation
--- PASS: TestAccGithubUtilRole_validation (0.00s)
=== RUN   TestAccGithubUtilTwoPartID
--- PASS: TestAccGithubUtilTwoPartID (0.00s)
FAIL
exit status 1
FAIL	github.com/hashicorp/terraform/builtin/providers/github	64.311s
make: *** [testacc] Error 1

The two failures are caused by a breaking change in the upstream API, related PR: #14195

[stack72]

LGTM!

[ghost]

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