Added script for checking Ulimit for users

Will allow to check ulimit usage for a specific user, currently supporting the glassfish user.

There are a few manual commands that will be sycofied together with the glassfish installation to make it a default monitoring script for the glassfish suite.

Also fixed a typo in the check_temp script that would cause wrong perfdata to be sent.
New function to install the check_ulimit script, it is a bit messy but tried to avoid repeated code.