PERL-370 fixed bulk upserts with non OID _id

Prior to 2.6, upserts with non OID _id didn't return the _id in the
upserted field.  This commit detects that situation and grabs the _id
from the update document or query document.
PERL-356 split out static vs dynamic tests

Moved replica set tests that require orchestration to devel/ directory.

Amended remaining tests to run against default external tests database.
ensure master client is also in refreshed host list

The old code was creating a new MongoClient for the host list, separate
from the one stored as "master". This is potentially confusing for code
that checks if the read preference object (which gets drawn from the
host list) is the same as the master object.
PERL-368 coerce query documents into Tie::IxHash objects
updated Changes