Slow resource gathering for Euare with regards to large number of accounts/users/groups

[hspencer77]

When running the eucafrontend module, if there are a great number of accounts/users/groups (e.g. 100 users and 100 groups), gathering Euare resources takes awhile.

[quadespresso]

We've noticed this in CS and sustaining as well. Due to how these commands can compound one another geometrically, I don't see a simple resolution to this.

As such, I've separated out the euca2ools commands from eucafrontend into separate plugins:

• euca2ools_core
• euca2ools_euare
• euca2ools_euform
• euca2ools_eulb
• euca2ools_euscale
• euca2ools_euwatch

and dropped the all-in-one eucafrontend plugin.

Also, I've made euca2ools_euare disabled ('optional' in sosreport parlance) by default. Doing this has proven quite favorable in overall sosreport run times during testing. If we really need it, we can always ask to run it as "sosreport --batch -o euca2ools_euare".