changes log level to debug for help calls
changes log level to debug for help calls

Calling help typically causes the program being called to exit non-zero.
This causes the command to be logged as an error even though it should not be.
By setting 'log_fail_as_error=False' we log to debug.  This helps clean
up logs.

Change-Id: I13f9488b9bc524bb85047e9b2dcf4e8a76bd6c11
Closes-Bug: 1452425

bigswitch/neutron,mandeepdhami/neutron,mmnelemane/neutron,jumpojoy/neutron,mandeepdhami/neutron,infobloxopen/neutron,JioCloud/neutron,shahbazn/neutron,openstack/neutron,chitr/neutron,sasukeh/neutron,jacknjzhou/neutron,suneeth51/neutron,yanheven/neutron,MaximNevrov/neutron,adelina-t/neutron,skyddv/neutron,mattt416/neutron,vivekanand1101/neutron,apporc/neutron,asgard-lab/neutron,takeshineshiro/neutron,shahbazn/neutron,cloudbase/neutron,sasukeh/neutron,takeshineshiro/neutron,bgxavier/neutron,MaximNevrov/neutron,apporc/neutron,vivekanand1101/neutron,dims/neutron,NeCTAR-RC/neutron,mmnelemane/neutron,infobloxopen/neutron,jumpojoy/neutron,huntxu/neutron,openstack/neutron,SamYaple/neutron,mahak/neutron,klmitch/neutron,antonioUnina/neutron,eayunstack/neutron,noironetworks/neutron,suneeth51/neutron,javaos74/neutron,sebrandon1/neutron,JioCloud/neutron,wenhuizhang/neutron,igor-toga/local-snat,neoareslinux/neutron,jerryz1982/neutron,barnsnake351/neutron,paninetworks/neutron,yuewko/neutron,jacknjzhou/neutron,JianyuWang/neutron,JianyuWang/neutron,openstack/neutron,neoareslinux/neutron,yanheven/neutron,mahak/neutron,klmitch/neutron,yuewko/neutron,noironetworks/neutron,mattt416/neutron,skyddv/neutron,NeCTAR-RC/neutron,cloudbase/neutron,jerryz1982/neutron,silenci/neutron,barnsnake351/neutron,antonioUnina/neutron,dhanunjaya/neutron,igor-toga/local-snat,glove747/liberty-neutron,wolverineav/neutron,adelina-t/neutron,watonyweng/neutron,javaos74/neutron,cisco-openstack/neutron,dims/neutron,swdream/neutron,bgxavier/neutron,watonyweng/neutron,eonpatapon/neutron,eayunstack/neutron,SmartInfrastructures/neutron,SamYaple/neutron,eonpatapon/neutron,mahak/neutron,asgard-lab/neutron,wolverineav/neutron,SmartInfrastructures/neutron,sebrandon1/neutron,huntxu/neutron,bigswitch/neutron,dhanunjaya/neutron,silenci/neutron,wenhuizhang/neutron,glove747/liberty-neutron,cisco-openstack/neutron,paninetworks/neutron,chitr/neutron,swdream/neutron