Several people over the liberty cycle committed to maintaining
compose, but it was never completed.  Rather than carry compose
in our repoistory until the end of time in a broken state I propose
removing it.  If someone comes along and wants to resseruct the code
and make it functional in the future, I'd be 100% open to merge a
patch in the future which reintroduces this functionality.  In the
meantime it is confusing to users which ask me on a daily basis if
compose is supported which I have to go into a 10 minute monologue
about why its in the repository.

Fortunately git contains full history so we can always revert this
change at a later time if someone wants to actually fixt his code
base up and make it useable in some way.  I think the proper answer
is a seperate repoistory (kolla-compose) which contains any compose
related bits.

Please consider removing since nobody is using this code and its
dead.

TrivialFix

backport: liberty
Change-Id: I8b7c39b00d1967184d363af7db86d1ff8b5e725f