testsutie: Add testsuite for mapiproxy/util/mysql
mapiproxy/mysql: Reractor parse_connection_string() to be more stable

Not it passes all Unit tests in openchange_testsuite
mapiproxy/mysql: Call mysql_options() after connection is established

Avoid - http://osdir.com/ml/mysql/2014-03/msg00088.html
* A client crash occurred if mysql_set_server_option() or
several other C API functions were called before
mysql_real_connect(). (Bug #17338958)

I also hit this using AddressSanitizer and using MySQL 5.5.38
testsuite: Make compiler happy and initialize local variable before it's used
testsuite: Small README how to use unit test utility
testsuite: Don't use ck_assert_ptr_eq() - travis can't handle this yet
Merge pull request #81 from openchange/kamenim/master-mysql-util-testsuite

Few fixes in mysql utility module and testsuite