dev: extract install_gems() function for legibility
dev: extract install_gems() function for legibility

aspiers/crowbar,crowbar/crowbar,SUSE-Cloud/crowbar,rhafer/crowbar,aplanas/crowbar,dirkmueller/crowbar,tserong/crowbar,toabctl/crowbar,MaximilianMeister/crowbar,crowbar/crowbar,rhafer/crowbar,dirkmueller/crowbar,nkrinner/crowbar,toabctl/crowbar,rsalevsky/crowbar,vwallfahrer/crowbar,rsalevsky/crowbar,tserong/crowbar,aplanas/crowbar,nkrinner/crowbar,mmnelemane/crowbar,MaximilianMeister/crowbar,SUSE-Cloud/crowbar,aspiers/crowbar,vwallfahrer/crowbar,rhafer/crowbar,mmnelemane/crowbar