Now, we can't use os-fping API by default because devstack doesn't
install the fping package.
This commit adds installing the package and enabling to use os-fping
API.
Change-Id: Ibdc7479a9038321e4fc3953774a6f3e1dac90530
Closes-Bug: #1287468
openSUSE 12.3 comes with the DHCP lease utilities in the dnsmasq-utils
package.
Also drop the gcc dependency in n-api (like it was done for debian, see
e9e80f9)
Change-Id: Id045674946d7856f6364c2357f3e126b05651461