[bugfix rhel6 / rhel 7] Updated NFS anonuid/anongid

RHEL7 seems to have depricated the -1 value for anonuid/anongid. Updating guidance to show that any value
greater than UID_MAX and GID_MAX are functionally equivalent.

Removing RHEL 7 CCE

Updating RHEL 6 XCCDF to reflect that technically a -1 value is acceptable, but will cause interop issues

Traceback to Red Hat Support ticket # 01192254.

Updated patch for spelling & RHEL7 XCCDF

- Spelling per Gabe
- Drop RHEL7 CCE
- Drop anon* -1 value in RHEL 7
Merge branch 'nfs_anonuid' of github.com:shawndwells/scap-security-guide into nfs_anonuid

Conflicts:
	RHEL/6/input/services/nfs.xml