Fixed deployment timeout and OVSNFV plugin build

Fixed deployment timeout and OVSNFV plugin build

- Increase deployment timeout to 4h since some deplyments
  takes more than 3h (KVM)
- Fixed build interference between OVSNFV and OVS-NSH where the
  later removed the OVSNFV build result from release/opnfv.
  A propper fix for SR2 is to have f_isoroot/Makefile remove the release
  directory before build, and not have the plugins removing anythin in release

Change-Id: Ibca986554087d6a7f12ed8c7cc6fdd4919368ad2
Signed-off-by: Jonas Bjurel <jonas.bjurel@ericsson.com>