Travis:
* Don't install all g++ versions on all build targets.
* Install addons per target to have finer control on what is needed
* Use WSREP_STRICT_BUILD_FLAGS on other targets than GCC 4.8
cmake:
* Fixed CMakeLists.txt to check only boost libraries which are
actually needed
In order to make build successful on wider number of platforms,
removed -Weffc++ from default build options. Added a new cmake
option WSREP_LIB_STRICT_BUILD_FLAGS to enable it.
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.
Depending on the DBMS client session allocation strategy the
client id may or may not be available when the client_session
is constructed, therefore there should be a method to assign
an id after construction. Close/cleanup methods were added to
clean up open transactions appropriately.
