Projector client is now a separate sub-package.

projector client includes retry logic, with optional backoff algorithm
for "connection-refused" cases.

Change-Id: I68824fea2685f9bb6837cce21ea4f7c0a75a9f33
Reviewed-on: http://review.couchbase.org/42235
Reviewed-by: John Liang <johliang00@gmail.com>
Reviewed-by: Pratap Chakravarthy <prataprc@couchbase.com>
Tested-by: Pratap Chakravarthy <prataprc@couchbase.com>