Don't warn when files are already patched

Signed-off-by: Joe Stringer <joestringernz@gmail.com>
Fix fetching MongoDB,OVS from source

Signed-off-by: Joe Stringer <joestringernz@gmail.com>
Fix minor bugs in commandline flags

Signed-off-by: Joe Stringer <joestringernz@gmail.com>
Fix fetching RouteFlow

Signed-off-by: Joe Stringer <joestringernz@gmail.com>
Add version defaults for Ubuntu

Signed-off-by: Joe Stringer <joestringernz@gmail.com>
Recommend using ovs-git with Ryu

Signed-off-by: Joe Stringer <joestringernz@gmail.com>