[Asterisk-code-review] Introduce astcachedir, to be used for temporary bucket files (asterisk[16])

[lvl]

Hello George Joseph, Kevin Harwell, Friendly Automation, 

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

    https://gerrit.asterisk.org/c/asterisk/+/15076

to look at the new patch set (#2).

Change subject: Introduce astcachedir, to be used for temporary bucket files
......................................................................

Introduce astcachedir, to be used for temporary bucket files

As described in the issue, /tmp is not a suitable location for a
large amount of cached media files, since most distributions make
/tmp a RAM-based tmpfs mount with limited capacity.

I opted for a location that can be configured separately, as opposed
to using a subdirectory of spooldir, given the different storage
profile (transient files vs files that might stay there indefinitely).

This commit just makes the cache directory configurable, but leaves
it at /tmp by default, to ensure backwards compatibility.

A future commit that only targets master could change the default
location to something more sensible such as /var/tmp/asterisk. At
that point, the cachedir could be created and cleaned up during
uninstall by the Makefile script.

ASTERISK-29143

Change-Id: Ic54e95199405abacd9e509cef5f08fa14c510b5d
---
M Makefile
M build_tools/install_subst
M build_tools/make_defaults_h
M build_tools/mkpkgconfig
M configs/samples/asterisk.conf.sample
M configure
M configure.ac
A doc/CHANGES-staging/media_cache_cachedir.txt
M include/asterisk/paths.h
M main/bucket.c
M main/options.c
M main/pbx_variables.c
M makeopts.in
13 files changed, 31 insertions(+), 4 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/76/15076/2
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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: Ic54e95199405abacd9e509cef5f08fa14c510b5d
Gerrit-Change-Number: 15076
Gerrit-PatchSet: 2
Gerrit-Owner: lvl <digium at lvlconsultancy.nl>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Kevin Harwell <kharwell at digium.com>
Gerrit-MessageType: newpatchset
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