Add haproxy installation support for openSuSE
Add haproxy installation support for openSuSE

Support for SuSE based systems like OpenSUSE/SLES is added  that can install haproxy package via its own pkg manager `zypper` . SuSE based can be detected by existence of `/etc/SuSE-release` file .

pgkelley4/marathon,ss75710541/marathon,Caerostris/marathon,Caerostris/marathon,guenter/marathon,ss75710541/marathon,meln1k/marathon,janisz/marathon,janisz/marathon,ss75710541/marathon,timcharper/marathon,gsantovena/marathon,mesosphere/marathon,vivekjuneja/marathon,natemurthy/marathon,mesosphere/marathon,guenter/marathon,Caerostris/marathon,yp-engineering/marathon,meln1k/marathon,mesosphere/marathon,mesosphere/marathon,gsantovena/marathon,janisz/marathon,guenter/marathon,mesosphere/marathon,timcharper/marathon,timcharper/marathon,janisz/marathon,yp-engineering/marathon,titosand/marathon,natemurthy/marathon,guenter/marathon,gsantovena/marathon,titosand/marathon,guenter/marathon,meln1k/marathon,gsantovena/marathon,meln1k/marathon,meln1k/marathon,pgkelley4/marathon,vivekjuneja/marathon,Caerostris/marathon,janisz/marathon,vivekjuneja/marathon,gsantovena/marathon,natemurthy/marathon,Caerostris/marathon