Suricatasc

Hello,

Here is a small PR on suricatasc. The idea is to be able to run command outside of interactive mode. The '-c' flag allows user to ask for a command and get the return on stdout.

PR builds:
- PR build: https://buildbot.openinfosecfoundation.org/builders/regit/builds/12
- PR pcaps: https://buildbot.openinfosecfoundation.org/builders/regit-pcap/builds/10