1020912 - add pulp_manage_puppet selinux boolean

This adds new boolean which can be turned on with

    semanage boolean -m --on pulp_manage_puppet

or similar command. It is turned off by default.

Please help me testing this patch. After build and the command above, the rule
should be visible with

    sesearch -A -s httpd_t -t puppet_etc_t -C

Thanks