misc/bcfg2.spec: Fix bcfg2-web Requires for EPEL7

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>
misc/bcfg2.spec: Pull in cherrypy toggle from epel

This allows one to disable building of the bcfg2-server-cherrypy
package.

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>
misc/bcfg2.spec: Merge changelog from epel

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>