Updates to php5 plan
Updates to php5 plan

* Stop doing the thing where we symlink into /usr/bin for xml2-config;
  found a way to do this with a variable
* Add glibc as a direct, rather than transitive dep, because it is
* Add curl, exif, fpm, mbstring, opcache, openssl, zlib, and xmlrpc support
* Add sbin to bin_dirs (that's where php-fpm goes)

Fixes #327

Signed-off-by: Nathan L Smith <2b5c240e6abd88e71ffc225b0459016e4cba9bda@chef.io>

be-plans/be,be-plans/be,be-plans/be,be-plans/be