Fix Race Condition, More DB Support

Added ability to use additional JDBC drivers, as defined in sample
configuration. Added MySql from maven to test and it worked great. PGSQL
and MSSQL should work similarly, may test PGSQL later. Fixed a race
condition in the decoder or insert thread where more than one thread may
try to dequeue the same data and exhaust it. Added harmless Oops
messages to console only to show this.