CD git broker parameter updates

[gmarjoram]

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Relates OR Closes #0000

Output from acceptance testing:

make testacc TEST=./ibm/service/cdtoolchain TESTARGS='-run=TestAccIBMCdToolchainToolGithubconsolidated*' TEST_TIMEOUT=0
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./ibm/service/cdtoolchain -v -run=TestAccIBMCdToolchainToolGithubconsolidated* -timeout 0
=== RUN   TestAccIBMCdToolchainToolGithubconsolidatedDataSourceBasic
--- PASS: TestAccIBMCdToolchainToolGithubconsolidatedDataSourceBasic (27.01s)
=== RUN   TestAccIBMCdToolchainToolGithubconsolidatedDataSourceAllArgs
--- PASS: TestAccIBMCdToolchainToolGithubconsolidatedDataSourceAllArgs (26.66s)
=== RUN   TestAccIBMCdToolchainToolGithubconsolidatedBasic
--- PASS: TestAccIBMCdToolchainToolGithubconsolidatedBasic (24.74s)
=== RUN   TestAccIBMCdToolchainToolGithubconsolidatedAllArgs
--- PASS: TestAccIBMCdToolchainToolGithubconsolidatedAllArgs (39.97s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/cdtoolchain	122.511s

make testacc TEST=./ibm/service/cdtoolchain TESTARGS='-run=TestAccIBMCdToolchainToolGitlab*' TEST_TIMEOUT=0
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./ibm/service/cdtoolchain -v -run=TestAccIBMCdToolchainToolGitlab* -timeout 0
=== RUN   TestAccIBMCdToolchainToolGitlabDataSourceBasic
--- PASS: TestAccIBMCdToolchainToolGitlabDataSourceBasic (28.41s)
=== RUN   TestAccIBMCdToolchainToolGitlabDataSourceAllArgs
--- PASS: TestAccIBMCdToolchainToolGitlabDataSourceAllArgs (24.69s)
=== RUN   TestAccIBMCdToolchainToolGitlabBasic
--- PASS: TestAccIBMCdToolchainToolGitlabBasic (25.50s)
=== RUN   TestAccIBMCdToolchainToolGitlabAllArgs
--- PASS: TestAccIBMCdToolchainToolGitlabAllArgs (42.00s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/cdtoolchain	124.693s

make testacc TEST=./ibm/service/cdtoolchain TESTARGS='-run=TestAccIBMCdToolchainToolHostedgit*' TEST_TIMEOUT=0
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./ibm/service/cdtoolchain -v -run=TestAccIBMCdToolchainToolHostedgit* -timeout 0
=== RUN   TestAccIBMCdToolchainToolHostedgitDataSourceBasic
--- PASS: TestAccIBMCdToolchainToolHostedgitDataSourceBasic (27.46s)
=== RUN   TestAccIBMCdToolchainToolHostedgitDataSourceAllArgs
--- PASS: TestAccIBMCdToolchainToolHostedgitDataSourceAllArgs (25.14s)
=== RUN   TestAccIBMCdToolchainToolHostedgitBasic
--- PASS: TestAccIBMCdToolchainToolHostedgitBasic (23.38s)
=== RUN   TestAccIBMCdToolchainToolHostedgitAllArgs
--- PASS: TestAccIBMCdToolchainToolHostedgitAllArgs (46.89s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/cdtoolchain	126.840s