Update bootstrap.md

Change the network restart command to use sudo instead of being logged in as root. A user following through first time will not yet know how to login as root at this stage. Also indicate this change by showing $ (normal user) for the prompt instead of # (root prompt).
fix usage for enroll_cobbler.sh - needs IP address in non-Vagrant bringup
Merge pull request #12 from mihalis68/master

use sudo instead of requiring root before the user knows how to get that