Now since we have support for parallel launching in the command line
we can implement support for it in the modules.

Example (image config):

 run = [
   api.require('netperf').default,
   api.require('mgmt').shell
 ]

Result:

$ scripts/run.py
OSv v0.05-132-g779307c
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_INET

[/]%

Reviewed-by: Nadav Har'El <nyh@cloudius-systems.com>
Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>