Introduce ability to accept command arguments to build with DPDK or Linux kernel.

Introduce ability to accept command arguments to build with DPDK or Linux kernel.
Specify patches to apply, build kernel module RPM and build with a special
version of the kernel.

Also instack_ovs.sh creates a VM for building and initial testing of RPMs and
copies scripts to VMs

build_ovs_rpm.sh builds the RPM according to command line options.
test_ovs_rpm.sh tests the RPM by installing the RPM and running some ovs
commands to create a bridge and dump flows.

Also add two scripts generally to be executed in VM to do actual building and
Testing.

This 2nd series adds the following:

Use fedora spec file for kmod builds. Added Explanations to configuration options.
Fixes in response to review comments. Rename script for clarity and change
references: buildtestovs.sh -> BuildTestOVS.sh
Fix nocheck option, print default options, fix kmod option, fix test of kmod.

For command line options execute build/buildtestovs.sh -h

Change-Id: I415ca39afab27482b1cb473d392f48b36c8e0745
Signed-off-by: Thomas F Herbert <therbert@redhat.com>