rename helper functions in the acc ramp code to avoid confusion

The word 'enabled' was used in two contexts: Whether ACC ramp is
enabled as a feature, and whether a particular access control class
is permantly allowed/disallowed via VTY configuration.

Rename some helper functions to avoid the use of the word 'enabled'
in the latter context.

Change-Id: Ia67e84270cd50f4c55b8cf616ca38b00482f765c
Related: OS#2591
1 file changed