Replace all wsrep_api.h dependencies with similar code
in library implementation.
Also add gcc/g++ 4.4 to travis automation to get better
compiler coverage.
Use iterators for scanning members vector in order to avoid
issues with integer signedness and range checks. The vector is
usually rather small and not in hot codepath, so performance
is here not an issue.
Added unit test for member_index() method.
with superproject definitions.
Avoid using client_service::do_2pc() in before_commit() to
determine if 2pc is actually happening, will use transaction
states to deduce that. client_service::do_2pc() should be deprecated.
Fixed a compiler warning in db_high_priority_service.cpp.
