ceph-dev-new-setup: add "crimson" flavor

ceph-dev-new-setup: add "crimson" flavor

currently, we have two flavors for ceph builds

1. "default", which is, well, the default build.
2. "notcmalloc" -- "no tcmalloc", originally, it was only for applease
   valgrind. but now, it is more like a Debug build, which is less
   performant, but it is compiled with some facilities enabled to help
   debugging.

as crimson is not yet production ready, a new flavor is added in this
change -- "crimson". this flavor is built only for testing crimson
in sepia nodes.

Signed-off-by: Kefu Chai <kchai@redhat.com>