I'm writing up how the bosh_agent works, and using agent_client &
package_compiler for the hands-on tutorials.
Is "package_compiler apply"  used anywhere? Anyone using it?
There is also "package_compiler compile"  which is used within
stemcell_builder to pre-populate the microbosh & mcf filesystems with a
local blobstore of pre-compiled packages.
If "package_compiler apply" isn't being used then I might change its
arguments so the two commands tell a compelling story together.