Changes

asterisk: logger.conf: Log milliseconds in timestamps

Change-Id: I4d518547d1e284b18034ae195e6d05da283593de

asterisk-master: Fetch required branch directly

When I added the Dockerfile I initially wrote it in a 2 step fetch &
build, to try to avoid recompiling the whole thing every time some patch
from one of the devs was pushed to our building branch.
This, whoever, creates problems sometimes due to how the build system
for pjproject is generated when building asterisk, so let's drop the
2stage setup to avoid problems fetching from different branches, etc.

Change-Id: Id9fbee9cdb8f9387e0daefd7925df2542d384a91

asterisk-master: Build from jolly/work branch by default

That one will not be the final branch, but it's the one where most of
the development is happening. Hence, switch to that branch by default
for now, so that jenkins nightly job runs that branch.

Change-Id: Iabf141ae0b997f9707a7dbd555307e052b92d355