Depsolve the packages included in the templates and report any errors
using the /api/status 'msgs' field. This should help narrow down
problems with package sources not being setup correctly.
This includes a new configuration file at /etc/lorax/composer.conf with
built-in defaults. It also adds a YUMLOCK server config object so that
request handlers can access the yum base object without interfering
with each other.
This requires that the docs be at /usr/share/doc/lorax-*/html/ or if
running from the source tree, at ./docs/html/
They can be re-created by running 'make docs'
The lorax-composer program will launch a BDCS compatible API server
using Flask and Gevent. Currently this is a skeleton application with
only one active route (/api/v0/status).
The API code lives in ./src/pylorax/api/v0.py with related code in other
pylorax/api/* modules.
