[bugfix] [RHEL/7] Drop service_haldaemon_disabled XCCDF rule from RHEL-7 content.

HAL daemon has been removed in Fedora-16:
&nbsp;          [1] https://ask.fedoraproject.org/en/question/8747/hal-daemon-gone-or-not/
&nbsp;           [2] http://fedoraproject.org/wiki/Features/HalRemoval#Release_Notes

and replaced / obsoleted by udisks / upower, as well as libudev for device
discovery (the service doesn't exist anymore in RHEL-7 => no point the recommendation
to disable it to be present there).

The particular ```service_haldaemon_disabled.sh``` remediation fix has been previously deleted within the commit:
&nbsp;  [3] https://github.com/OpenSCAP/scap-security-guide/commit/92f0963d78d297ac823f770e32334ddf8032de87

which was part of pull request #239 (which got already included as of today).

The ```service_haldaemon_disabled.xml``` RHEL-7 OVAL check didn't exist / wasn't created yet, therefore it's enough to delete just the XCCDF rule.

Please review.

Thanks, Jan.