Options get lost and Memory-leak when reconnecting

Hi Georg,

thanks for fixing the bug CONC-117. But there are still a few bugs which need to be fixed in function "mysql_reconnect" from file "libmariadb.c" :

1. Original options from client would get lost if reconnecting fails, because of the bzero() before function "mysql_real_connect()"

2. The free_me flag in original mysql object is set to 0, which would lead to memory leak. You should store the old value and set it back after cloning from tmp_mysql object.

I wrote the patch with some comment. More details and descriptions can be found in uploaded file.