contrail-utils: Fix install directory and alias provision script in PATH

With a .example file contrail-utils script go to
/usr/share/doc/contrail-utils/examples and py executables are gziped…
this not usable. This patch move all contrail controller utils scripts
to /usr/share/contrail-utils and alias all provision script in
secure-bin PATH.
contrail-utils: Add {add,del}_route_target script also (to debug purpose)
Merge pull request #116 from sbadia/fix-contrail-utils

contrail-utils: Fix install directory and alias provision script in PATH