Include full response body for HTTP unknown errors.
Include full response body for HTTP unknown errors.

Change-Id: Ia0f939cb05826fe4efe853bd73d343a753e9bdfd
Reviewed-on: http://review.couchbase.org/77201
Reviewed-by: Mark Nunberg <dab05a0fe859c5cb93882b2a75a0d613501b07be@couchbase.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

brett19/couchnode,couchbase/couchnode,brett19/couchnode,couchbase/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode