ARI - GET /ari/asterisk/info
This patch adds basic system information access to ARI.
The results are roughly what you get from 'core show settings', with a
few minor differences.
* Data is structured, with 'build', 'system', 'config' and 'status'
sub-objects.
* Each sub-object is selectable, using the ?only= parameter. A comma
separated list can be provided to select multiple sections.
* A few config options are numeric, for which 0 means 'unlimited'.
Instead of having a special interpretation of those fields, they
are simply omitted if they're 0.
* The information is limited to what might be useful to building
external applications.
(closes issue ASTERISK-21575)
Review: https://reviewboard.asterisk.org/r/2702/
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@396125
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