[BugFix] [RHEL/6] mountopt_nodev_on_removable_partitions rule:
* Unify XCCDF id with OVAL id
* fix OVAL check not to return error (proper variable name is
  var_removable_partition, not nodev_var_removable_partition)
* fix couple of whitespace noise issues in XCCDF description
[BugFix] [RHEL/6] mountopt_nosuid_on_removable_partitions rule:
* Unify XCCDF id with OVAL id,
* fix OVAL check not to return an error as result (use proper
"var_removable_partition" passed variable name instead of
"nosuid_removable_media"),

Also fix yet one occurrence of 'nodev_var_removable_partition'
variable I forgot to fix in previous patch.
[Enhancement] [RHEL/6] mount_option_nodev_removable_partitions rule:
* Allow the OVAL check to PASS if the expected removable device doesn't
exist on the underlying system (default value of 'var_removable_partition'
variable is '/dev/cdrom'. But since there can exist systems without
/dev/cdrom | /dev/sr0 devices, the check shouldn't fail of the device
isn't present) -- IOW we should check 'nodev' option only in case specific
device truly exists on the system,
* Couple of other cosmetic changes for OVAL check (move id= always to be the
first attribute, version= the last one, align order of OVAL objects definitions
with order of OVAL tests definitions etc.)
[Enhancement] [RHEL/6] mount_option_noexec_removable_partitions rule:
* when checking 'noexec' option on removable partitions verify the underlying
partition / device truly exists on the system in question (to return
appropriate result),
* couple of other cosmetic changes to OVAL check (make id= attribute be the
leading one, version= attribute the last one, list OVAL objects in the order
OVAL tests are listed, add blank rows for better overall check readability etc.)
[Enhancement] [RHEL/6] mount_option_nosuid_removable_partitions rule:
* enhance OVAL check to also test if expected removable partition / device
truly exists on the underlying system. If not, allow the check to pass
(since in that case there's nothing to check 'nosuid' option to be present at),
* couple of small cosmetic changes to the OVAL check (id= to be first attribute,
version= the last, re-order objects definitions, add blank rows for better overall
check readability etc.)
Merge pull request #371 from iankko/rhel6_removable

[BugFix] [Enhancement] [RHEL/6] Various no{dev,exec,suid} removable partition rules' fixes