add "critical resource" check (disk space, allocations, etc)

[wwlwpd]

Key here is to properly dispatch based on platform; thing of checking:

• disk space (quota status if necessary)
• user available SUs
• should have an asgsh cli flag to report then quit, in a format that is useful for scripting

Commands: asgsh (profile)> check storage asgsh (profile)> check allocations asgsh (profile)> check queued

... etc

This might be split up by platform or resource check as needed.

[wwlwpd]

Adding that a bare check command should check all 3. Also, output should be provided such that it is human readable and also easily parsed via awk so that it can be extracted and used for recording and for checking limits

[jasonfleming]

Related to #316 but with the additional idea of having the Operator be able to do the checks at will via asgsh.

[jasonfleming]

Also need to communicate this info, related to #152