move some freeswitch config files out of the freeswitch/ tree and symlink so
that they become configurable
Apply new PBX_* variable naming
fill_config: enable symlinks;
ignore template function 'strftime' because freeswith cfg uses that.
Change-Id: I97d3db87398c743637f7eb13629e21b149bcc8fa
Neels Hofmeyr