Add certificate of origin and update authors

Define the developer's certificate of origin, which specifies
what the signed-off-by line actually means.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Merge branch 'master' into dev
Merge branch 'master' into dev
fabric: Add 'fi' prefix to internal header files

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
prov/sockets: Remove indexer.h from socket src directory

Signed-off-by: Sean Hefty <sean.hefty@intel.com>