CREATE INDEX and DROP INDEX passes with 2i.

- fixed function signature issues with scan-coordinator client.
Ignore secondary_index_test.go
2i - graceful error handling for CREATE/DROP.

Fixed govet issue.
Inclusion map between n1ql and 2i.
datastore: Change indexer queryport for 2i

Change-Id: I27c7cf0f75e51112c745e1b403528a987a1b93e6