This fix #5351.

This remove a useless warning saying that a model was not supported
altough it was.

But for BLFs, the supervision still doesn't work when using the failover
identity.

It supports the T4X phones, which are already supported by the newer
xivo-yealink-72.0 plugin.

A little bit.

Lines starting with a comma are not valid in the M7+M2 configuration
file. At least, the T38 is not updating its configuration when this line
is present.

Replaced/superseded by xivo-snom-8.7.5.13.

Update all firmware versions for Yealink 72.0 plugin

The 8.7.5.13 firmware is a beta firmware.

When using HTTPS, the phones use SSLv3, and since SSLv3 support has been
removed on XiVO on the 443 port, the directory is not accesible anymore
with the default configuration on the Aastra.

Other phones (Snom, Yealink) use HTTP to interact with the remote
directory. The Aastra phones downloads its configuration file using
HTTP. The phone doesn't do certificate verification. The remote
directory is accessible to anyone with an allowed IP address.

If someone really wants to use HTTPS to interact with the remote
directory, a custom template can always be used.

default parameter values were changed on all cisco-spa plugins.

It's not the same as for the other SPA.

Some parameters were duplicated.