fix_missing_brpc_version_in_release: add branch info to git env

RELEASE_VERSION

-30ff183a
+0.9.7

tools/get_brpc_version.sh

 #!/bin/bash
 
-v=$(git rev-parse --short HEAD 2> /dev/null)
+version=$(git rev-parse --short HEAD 2> /dev/null)
+branch=$(git rev-parse --abbrev-ref HEAD 2> /dev/null)
 if [ $? -eq 0 ]
 then
-    echo $v
+    echo $version-$branch
 else
     cat $1/RELEASE_VERSION
 fi