Fixes #163.

New Smart probe API broke the cpumetric. Fix it by refactoring the view and
supporting code. Also disable pagination for get requests for specific single
objects.
New cpumetric view
Merge pull request #165 from schakrava/issue#163_cpu_util

Issue#163 cpu util
Merge branch 'issue#160_system_users' of https://github.com/schakrava/rockstor-core into schakrava-issue#160_system_users
System users

Modify prep_db to add django admin, rockstor, and unix users
System users

Modify setup users to work with new user model
Set idAttribute name in user model
Remove trailing slash from user urls