Fixing regex pattern in OVSDB and NM module

Fixing regex pattern in OVSDB and NM module

Due to changes in yangotools, regex patters
are automatically supplied with starting ^ and
ending $ control chars.

E.g. ^tcp$|^udp$ in model
     results to
     ^\^tcp\$|\^udp\$$
     in code

Removing unused module from neutron-mapper

Change-Id: Icb8b62f308526b78b4dd3cfd7250b821f95fa165
Signed-off-by: Tomas Cechvala <tcechval@cisco.com>