Fix bug where clusterctl move does not work, and add correct default …

[shyamradhakrishnan]

Fix bug where clusterctl move does not work, and add correct default label

What this PR does / why we need it:

clusterctl move was not working in CAPOCI. This was because CAPOCI used the cluster UID to tag all OCI resources created, and during reconciliation, made sure that the tags matched. But during move, the cluster UID changes. So we cannot use cluster UID as the tag. Instead what we will do is to generate UID in the defaulter and use that to tag the OCI resources. This UID will not changes as it is not the auto-generated tag.

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 #73

[shyamradhakrishnan]

Unit test output

Using cached envtest tools from /Users/shyaradh/oke/src/github.com/oracle/cluster-api-provider-oci/testbin
setting up env vars
?   	github.com/oracle/cluster-api-provider-oci	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/api/v1beta1	2.839s	coverage: 7.8% of statements
?   	github.com/oracle/cluster-api-provider-oci/cloud/config	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/cloud/ociutil	0.521s	coverage: 30.3% of statements
ok  	github.com/oracle/cluster-api-provider-oci/cloud/scope	180.930s	coverage: 81.9% 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	32.241s	coverage: 71.0% of statements

e2e test output

• [SLOW TEST:563.289 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 [PRBlocking]
  /home/ubuntu/go/src/github.com/oracle/cluster-api-provider-oci/test/e2e/cluster_test.go:470
------------------------------
STEP: Tearing down the management cluster


Ran 5 of 21 Specs in 1703.699 seconds
SUCCESS! -- 5 Passed | 0 Failed | 0 Pending | 16 Skipped