Implement av-insertsym
- Add av-insert-sym (Fixes #430)
- Fix incorrect return value for av_insert* calls.

Signed-off-by: Jithin Jose <jithin.jose@intel.com>
Merge branch 'pr/sockets' into sockets_devel
Merge branch 'sockets_devel' of https://github.com/jithinjosepkl/libfabric into connmap-devel