Fixed typo in ip clean up routine.
Merge pull request #88 from bpwook/static_ip

Fixed typo in ip clean up routine.

Signed off by Jun Wook Kwak (junwook.kwak@citrix.com)
Add CentOS7 support
Merge pull request #89 from bpwook/centos7

Add CentOS7 support

Reviewed by: Jun Wook Kwak (junwook.kwak@citrix.com)
Signed-off by: Jun Wook Kwak (junwook.kwak@citrix.com)