[RHEL/7] Version #2 of service_disabled (unix:file_test) template for systemd.

         Service is considered disabled if:
         * corresponding RPM isn't installed OR,
         * particular service got masked OR,
         * particular service is disabled on boot AND not enabled at runtime.

         Also apply that template against abrtd service for testing.
[RHEL/7] Version #2 of service_enabled (unix:file_test) template for systemd.

         Service is considered enabled if:
         * corresponding RPM is installed AND,
         * service in question is not masked AND,
         * service in question is enabled on boot time [*].

         Also apply that template against iptables service for testing.

[*] It's not needed to check if service isn't disabled at runtime, and
    simultaneously enabled on boot time, since this configuration is
    unreachable.
[bugfix] Selector ID for file_permissions_grub2_cfg

- Fixes #242
Merge pull request #243 from redhatrises/grub2_error

[bugfix] Selector ID for file_permissions_grub2_cfg
Merge pull request #230 from iankko/v2_rhel7_service_disabled_enabled

[bugfix] [RHEL/7] Version #2 of service_disabled & service_enabled (unix:file_test based) template for systemd