cleanup(): drop mostly duplicated function
cleanup(): drop mostly duplicated function

A cleanup() function is already defined in common which do the same
things:
 - catch error by reading $ret
 - umount related filesystem, including ISO_MOUNT_POINT
 - generated .edeploy archive

redhat-cip/edeploy,redhat-cip/edeploy,lebauce/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy,enovance/edeploy,redhat-cip/edeploy,enovance/edeploy,lebauce/edeploy,enovance/edeploy,lebauce/edeploy