Allow either style of monit startup flag to work

Monit packages for Ubuntu 10.04 use the older "startup=0|startup=1"
syntax, while 12.04 and newer use the "START=no|START=yes" syntax.  This
change allows either style to be detected & updated.
Merge pull request #36 from esigler/allow-either-startup-flag-style

Allow either style of monit startup flag to work