Renaming RHEL CCE file

Renaming RHEL CCE file to reflect CCEs are for all of RHEL

process:
[shawnw@ssgdev-rhel7 references]$ git mv cce-rhel6-avail.txt cce-rhel-avail.txt
[shawnw@ssgdev-rhel7 references]$ cd ../../
[shawnw@ssgdev-rhel7 scap-security-guide]$ grep -rin cce-rhel6-avail.txt *
RHEL/6/utils/verify-cce.py:29:with open('../references/cce-rhel6-avail.txt', 'r') as txt_file:
[shawnw@ssgdev-rhel7 scap-security-guide]$ sed -i 's/cce-rhel6-avail.txt/cce-rhel-avail.txt/g' RHEL/6/utils/verify-cce.py
Added CCEs for rules in RHEL7 CCP profile

Note that I did skip the IPTables rules, as these will be going away.
Merge branch 'rhel7-cce-assignment' of https://github.com/shawndwells/scap-security-guide into shawndwells-rhel7-cce-assignment

Conflicts:
	RHEL/7/input/system/accounts/pam.xml
Merge branch 'shawndwells-rhel7-cce-assignment'

merging CCEs into PAM checks