Fix persistent diff for kubernetes_ca_cert in k8s-auth-config

[benashz]

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Relates OR Closes #904

Release note for CHANGELOG:

Output from acceptance testing:

$ make testacc TESTARGS='-v -test.run TestAccKubernetesAuth'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -v -v -test.run TestAccKubernetesAuth -timeout 30m ./...

[...]

ok      github.com/hashicorp/terraform-provider-vault/util      (cached) [no tests to run]
=== RUN   TestAccKubernetesAuthBackendConfigDataSource_basic
--- PASS: TestAccKubernetesAuthBackendConfigDataSource_basic (3.32s)
=== RUN   TestAccKubernetesAuthBackendConfigDataSource_full
--- PASS: TestAccKubernetesAuthBackendConfigDataSource_full (3.05s)
=== RUN   TestAccKubernetesAuthBackendRoleDataSource_basic
--- PASS: TestAccKubernetesAuthBackendRoleDataSource_basic (1.82s)
=== RUN   TestAccKubernetesAuthBackendRoleDataSource_full
--- PASS: TestAccKubernetesAuthBackendRoleDataSource_full (1.79s)
=== RUN   TestAccKubernetesAuthBackendConfig_import
--- PASS: TestAccKubernetesAuthBackendConfig_import (13.00s)
=== RUN   TestAccKubernetesAuthBackendConfig_basic
--- PASS: TestAccKubernetesAuthBackendConfig_basic (1.75s)
=== RUN   TestAccKubernetesAuthBackendConfig_update
--- PASS: TestAccKubernetesAuthBackendConfig_update (3.05s)
=== RUN   TestAccKubernetesAuthBackendConfig_full
--- PASS: TestAccKubernetesAuthBackendConfig_full (1.74s)
=== RUN   TestAccKubernetesAuthBackendConfig_fullUpdate
--- PASS: TestAccKubernetesAuthBackendConfig_fullUpdate (4.38s)
=== RUN   TestAccKubernetesAuthBackendConfig_localCA
--- PASS: TestAccKubernetesAuthBackendConfig_localCA (3.00s)
=== RUN   TestAccKubernetesAuthBackendRole_import
--- PASS: TestAccKubernetesAuthBackendRole_import (2.16s)
=== RUN   TestAccKubernetesAuthBackendRole_basic
--- PASS: TestAccKubernetesAuthBackendRole_basic (1.72s)
=== RUN   TestAccKubernetesAuthBackendRole_update
--- PASS: TestAccKubernetesAuthBackendRole_update (3.10s)
=== RUN   TestAccKubernetesAuthBackendRole_full
--- PASS: TestAccKubernetesAuthBackendRole_full (1.71s)
=== RUN   TestAccKubernetesAuthBackendRole_fullUpdate
--- PASS: TestAccKubernetesAuthBackendRole_fullUpdate (6.91s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/vault     56.008s

...

[vinay-gopalan]

Looking good! Encountered a failing test when running locally, and left a suggested change