new scheme for install actions

From the comment in the code

# perform install actions for the barclamp
# look for setup/* files and execute the appropriate ones, in order, based on
# the lifecycle stage the barclap is going through :
#  :install - IXXX
#  :update - UXXX
#
# The XXX is sorted, and the scripts are executed in order.
# The crowbar reserves the ranges 0-9 and 50-9.
# Other params:
#   bc - the barclamps name
#   bc_path - the full path for the barclamp's files