胡斌 / srs

This reverts commit 595e696d.

…am name when forward to cdn

origins will not be forward any more.
remove forward_server_srs,which used to indicate the forward target server is or is not srs,
add forward_server_other, to list the target rtmp server other than srs in.

in forward_in_turn list in turn

2.add forward_server_srs,true or false,default true,directive in config file in vhost section
to disable connect app req params to make connect app success when connect some cdn server

git version string example:2.0+ r3504M 6bf24238 2017-02-28 19:10:44
which means: branch , revison index, commit hash, date time