The PKI role key_usage value should be computed

[benashz]

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Closes #748

Release note for CHANGELOG:

Output from acceptance testing:

$ time make testacc TESTARGS='-v -test.count 1 -test.run Test*Pki*'

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -v -v -test.count 1 -test.run Test*Pki* -timeout 30m ./...

ok      github.com/hashicorp/terraform-provider-vault/util      0.613s [no tests to run]
=== RUN   TestPkiSecretBackendCert_basic
--- PASS: TestPkiSecretBackendCert_basic (5.76s)
=== RUN   TestPkiSecretBackendCert_revoke
--- PASS: TestPkiSecretBackendCert_revoke (5.18s)
=== RUN   TestPkiSecretBackendCert_renew
--- PASS: TestPkiSecretBackendCert_renew (10.13s)
=== RUN   TestPkiSecretBackendConfigCA_basic
--- PASS: TestPkiSecretBackendConfigCA_basic (1.71s)
=== RUN   TestPkiSecretBackendConfigUrls_basic
--- PASS: TestPkiSecretBackendConfigUrls_basic (2.90s)
=== RUN   TestPkiSecretBackendCrlConfig_basic
--- PASS: TestPkiSecretBackendCrlConfig_basic (2.19s)
=== RUN   TestPkiSecretBackendIntermediateCertRequest_basic
--- PASS: TestPkiSecretBackendIntermediateCertRequest_basic (1.83s)
=== RUN   TestPkiSecretBackendIntermediateSetSigned_basic
--- PASS: TestPkiSecretBackendIntermediateSetSigned_basic (3.69s)
=== RUN   TestPkiSecretBackendRole_basic
--- PASS: TestPkiSecretBackendRole_basic (3.04s)
=== RUN   TestPkiSecretBackendRootCertificate_basic
--- PASS: TestPkiSecretBackendRootCertificate_basic (7.84s)
=== RUN   TestPkiSecretBackendRootSignIntermediate_basic_default
--- PASS: TestPkiSecretBackendRootSignIntermediate_basic_default (2.89s)
=== RUN   TestPkiSecretBackendRootSignIntermediate_basic_pem
--- PASS: TestPkiSecretBackendRootSignIntermediate_basic_pem (3.20s)
=== RUN   TestPkiSecretBackendRootSignIntermediate_basic_der
--- PASS: TestPkiSecretBackendRootSignIntermediate_basic_der (4.97s)
=== RUN   TestPkiSecretBackendRootSignIntermediate_basic_pem_bundle
--- PASS: TestPkiSecretBackendRootSignIntermediate_basic_pem_bundle (4.88s)
=== RUN   TestPkiSecretBackendRootSignIntermediate_basic_pem_bundle_multiple_intermediates
--- PASS: TestPkiSecretBackendRootSignIntermediate_basic_pem_bundle_multiple_intermediates (2.93s)
=== RUN   TestPkiSecretBackendSign_basic
--- PASS: TestPkiSecretBackendSign_basic (4.24s)
=== RUN   TestPkiSecretBackendSign_renew
--- PASS: TestPkiSecretBackendSign_renew (15.04s)
PASS
ok      github.com/hashicorp/terraform-provider-vault/vault     84.715s
make testacc TESTARGS='-v -test.count 1 -test.run Test*Pki*'  72.16s user 31.41s system 106% cpu 1:37.01 total

[vinay-gopalan]

LGTM!