Use FDQN attribute in Boundary namespace

`node[:fqdn]` is set by ohai and has a highest precedence and
"can not be modified" per
http://docs.opscode.com/essentials_cookbook_attribute_files.html.

This changes the bprobe name to an attribute with a lower priority
so it can be overwritten. Eg `normal[:boundary][:fqdn] = 'foo'`.
Refactor name of hostname attribute

Based on the pull request feedback...
Merge pull request #7 from finack/feature/hostname

Use FDQN attribute in Boundary namespace
map chef roles to boundary node tags
Merge pull request #13 from boundary/roles_tags

map chef roles to boundary node tags
Merge pull request #9 from universityofderby/yum_repository

There are breaking changes in the lastest version of the yum cookbook
Merge pull request #1 from filler/master

Merge in of new filler commits