Add ClusterClass template for OCICluster

[shyamradhakrishnan]

What this PR does / why we need it:
This PR create an OCICluster template to be used in ClusterClass and creates e2e test for the same. The PR also fixes a bug in machine reconciler which was assuming ocicluster name was same as cluster name.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #59

[shyamradhakrishnan]

Unit test output

setting up env vars
?   	github.com/oracle/cluster-api-provider-oci	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/api/v1beta1	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/config	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/cloud/ociutil	0.676s	coverage: 30.3% of statements
ok  	github.com/oracle/cluster-api-provider-oci/cloud/scope	76.702s	coverage: 83.5% of statements
?   	github.com/oracle/cluster-api-provider-oci/cloud/scope/mocks	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/compute	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/compute/mock_compute	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/identity	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/identity/mock_identity	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/networkloadbalancer	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/networkloadbalancer/mock_nlb	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/vcn	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/vcn/mock_vcn	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/controllers	27.915s	coverage: 68.3% of statements

[shyamradhakrishnan]

ClusterClass e2e test run

• [SLOW TEST:583.598 seconds]
Workload cluster creation
/home/ubuntu/go/src/github.com/oracle/cluster-api-provider-oci/test/e2e/cluster_test.go:49
  ClusterClass - with 1 control-plane nodes and 1 worker nodes
  /home/ubuntu/go/src/github.com/oracle/cluster-api-provider-oci/test/e2e/cluster_test.go:424

The ccm e2e test failed because of using wrong image, other tests passed

STEP: Tearing down the management cluster


Ran 1 of 18 Specs in 572.329 seconds
FAIL! -- 1 Passed | 0 Failed | 0 Pending | 17 Skipped

Ran the ccm e2e again with correct image

• [SLOW TEST:995.806 seconds]
Workload cluster creation
/home/ubuntu/go/src/github.com/oracle/cluster-api-provider-oci/test/e2e/cluster_test.go:49
  Cloud Provider OCI testing
  /home/ubuntu/go/src/github.com/oracle/cluster-api-provider-oci/test/e2e/cluster_test.go:201
------------------------------
STEP: Tearing down the management cluster


Ran 1 of 18 Specs in 1097.883 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 17 Skipped

[joekr]

There is just the one small copyright change but LGTM