barclamp_install: Remove "replacer" feature
barclamp_install: Remove "replacer" feature

This was used to replace some placeholders by real values, but the code
is actually totally unused right now (dead branches). And people should
just fix that in their barclamps anyway.

toabctl/crowbar,SUSE-Cloud/crowbar,toabctl/crowbar,aplanas/crowbar,crowbar/crowbar,dirkmueller/crowbar,rsalevsky/crowbar,rsalevsky/crowbar,dirkmueller/crowbar,crowbar/crowbar,aplanas/crowbar,SUSE-Cloud/crowbar