Merge pull request #3 from tumblr/mount_stats_function

adding mount stasts function
Add a config variable for setting private interface name, instead of always assuming bond0
Merge branch 'master' of github.com:tumblr/jetpants
Make user/privilege-related methods in DB class provide output
Create method DB.random_password for generating random strings for use in temporary mysql user passwords
Document the new private_interface configuration setting.