Fix http check on SUSE platform. Addresses bnc#828453

On SUSE platform Apache's binary is called 'httpd2'.

This addresses one of the issues reported by bnc#828453.
Merge pull request #531 from flavio/fix_http_check_on_suse_platform

Fix http check on SUSE platform. Addresses bnc#828453
Adding F19 to the distro signatures
Adding Flavio Castelli <fcastelli@suse.com> to the AUTHORS file