fabric: fix the prototype of fi_tsearch

"Src_addr" should be an input/output parameter, and "src_addrlen"
is no longer needed.

Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>
prov/psm: check flags and set src_addr in fi_tsearch

Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>
Merge pull request #91 from j-xiong/master

fabric: fix the prototype of fi_tsearch