[Asterisk-code-review] app voicemail: Remove need to subscribe to stasis (asterisk[13])

[George Joseph]

Hello Richard Mudgett, Jenkins2, Sean Bright, Joshua Colp, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/10132

to look at the new patch set (#7).

Change subject: app_voicemail: Remove need to subscribe to stasis
......................................................................

app_voicemail: Remove need to subscribe to stasis

app_voicemail was using the stasis cache to build and maintain a
list of mailboxes that had subscribers.  It then used this list
to determine if a mailbox should be polled for new messages if
polling was enabled.  For this to work, stasis had to cache every
subscription and unsubscription to the mailbox which caused a lot of
overhead, both cpu and memory related.

Since polling is only required when changes are being made to
mailboxes outside of app_voicemail and since the number of mailboxes
that don't have any subscribers is likely to be very low, all
mailboxes are now polled instead of just the ones with subscribers.

This paves the way for disabling the caching of stasis subscription
change messages.

Also fixed cleanup in some of the unit tests that not only left
test users in the users list but also caused segfaults if the tests
were run more than once.

ASTERISK-27121

Change-Id: I5cceb737246949f9782955c64425b8bd25a9e9ee
---
M apps/app_voicemail.c
M configs/samples/voicemail.conf.sample
2 files changed, 241 insertions(+), 279 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/32/10132/7
-- 
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Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5cceb737246949f9782955c64425b8bd25a9e9ee
Gerrit-Change-Number: 10132
Gerrit-PatchSet: 7
Gerrit-Owner: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Jenkins2
Gerrit-Reviewer: Joshua Colp <jcolp at digium.com>
Gerrit-Reviewer: Richard Mudgett <rmudgett at digium.com>
Gerrit-Reviewer: Sean Bright <sean.bright at gmail.com>
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