README: Remove unnecessary instruction to create RPMS directory

Mock creates this directory if it doesn't exist.

Signed-off-by: Euan Harris <euan.harris@citrix.com>
build: Take mock configuration from a local directory

This removes the need to be root to set up a build environment.

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #107 from euanh/build-improvements

Remove the need to install xenserver.cfg in /etc/mock