Remove PE 2.9 mockset (it became PE 3), and update comment.
Move pe-mock-config.erb to pe-el-mock-config, and update the template call.
Add sles mock template for pe-mocks

This commit adds a template for sles mock configs. This points the sles mock at
internal mirrors and uses a custom useradd command because useradd for sles
differs from el and fedora in what flags it accepts. The chroot setup command
also differs because the available packages differ.
Merge pull request #24 from haus/add_sles_mocks

Add sles mocks