inveniocfg should have targets to drop/create database

[jblayloc]

inveniocfg should have some other options:
--create-database
--drop-database

I think it would be ok to require the user to save the mysql connection information and root password aside (for example in a file in the user's home directory) to be able to run this. Or simply pause for them to be entered by the user; this certainly is no more annoying that pausing for Enter during the configure process.