Base pkg installation on inception VM: Make it compatible with Ubuntu 12.04.

This includes not installing mkpasswd (but keeping it installed for 10.04), and adding "-y" to the PPA addition.
Base packages installation: Install the whois instead of mkpassword packages on Ubuntu != 10.04.
Merge pull request #162 from nand2/master

Base pkg installation on inception VM: Make it compatible with Ubuntu 12.04
Fix microbosh destroying typo [fix #163]
Merge pull request #164 from rkoster/fix_update_deploy

Fix microbosh destroying typo [fix #163]
Base packages install: Lesson of the day: even if looks obvious, test. Fixing the "-y" option being not present in 10.04 and throwing an error.
Merge pull request #165 from nand2/master

Fixing my previous alteration of the base pkg install script