Bump zeromq version

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Fix cgroup grep when installing VMs

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Fail if containers cannot be created

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Update OVS build requirements

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Tidy up OVS compile/install

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Update Ryu dependencies

Signed-off-by: Joe Stringer <joe@wand.net.nz>
fetch: Change directory more consistently

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Make zeromq install more consistently

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Minor cleanups

Signed-off-by: Joe Stringer <joe@wand.net.nz>
Allow rftests to be run from top level

Signed-off-by: Joe Stringer <joe@wand.net.nz>