apache-rpm-macros-20150717-3.1

- bump version to 20150717

- %{apache_suse_maintenance_mmn} expands to just 'apache2' when
  apache2 does not provide suse_maintenance_mmn_# symbol

- new macro: %{apache_suse_maintenance_mmn} [bnc#915666] (internal)

- new macros: %{apache_user}, %{apache_group} [bnc#904409]

- add %{apache_datadir} macro

- fix %{apache_apxs} macro

- fix %{apache_branch} macro

- initial version of package 20141017 [bnc#673937]