Use externally managed replicas annotation and remove the CAPOCI specific flag which was introduced

[shyamradhakrishnan]

What this PR does / why we need it:
Use externally managed replicas annotation and remove the CAPOCI specific flag which was introduced

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 #201

[shyamradhakrishnan]

unit tests

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	1.034s	coverage: 17.9% of statements
?   	github.com/oracle/cluster-api-provider-oci/cloud/config	[no test files]
ok  	github.com/oracle/cluster-api-provider-oci/cloud/ociutil	0.485s	coverage: 25.0% of statements
ok  	github.com/oracle/cluster-api-provider-oci/cloud/scope	167.901s	coverage: 76.7% of statements
?   	github.com/oracle/cluster-api-provider-oci/cloud/scope/mocks	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/base	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/base/mock_base	[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/computemanagement	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/computemanagement/mock_computemanagement	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/containerengine	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/cloud/services/containerengine/mock_containerengine	[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	27.474s	coverage: 69.0% of statements
ok  	github.com/oracle/cluster-api-provider-oci/exp/api/v1beta1	1.858s	coverage: 10.0% of statements
ok  	github.com/oracle/cluster-api-provider-oci/exp/controllers	1.514s	coverage: 55.2% of statements
?   	github.com/oracle/cluster-api-provider-oci/feature	[no test files]
?   	github.com/oracle/cluster-api-provider-oci/version	[no test files]

[joekr]

Do you mind posting the output from the updated E2E test from this change?

[shyamradhakrishnan]

------------------------------
[SynchronizedAfterSuite] PASSED [0.924 seconds]
[SynchronizedAfterSuite]
/home/ubuntu/go/src/github.com/oracle/cluster-api-provider-oci/test/e2e/e2e_suite_test.go:252

  Timeline >>
  STEP: Tearing down the management cluster @ 01/13/23 04:26:39.946
  << Timeline
------------------------------

Ran 6 of 22 Specs in 2813.158 seconds
SUCCESS! -- 6 Passed | 0 Failed | 0 Pending | 16 Skipped