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Description of problem:
If I validate a RHEL6 kickstart on a RHEL7 server using pykickstart's ksvalidator (pykickstart-1.99.43.17-1.el7), it errors saying that "reserved-percent" is not valid.  Using the older version supplied with RHEL6 (pykickstart-1.74.20-1.el6) does not error.
The documentation for RHEL6 indicated that the option is in fact supported (confirm with a test deploy):
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s1-kickstart2-options.html
--reserved-percent= — Specify a percentage of total volume group space to leave unused. Only usable when creating a new volume group. 

Version-Release number of selected component (if applicable):
Rhel 7.0
Rhel 7.1
Rhel 7.2

How reproducible:
Every time

Steps to Reproduce:
1. include  "--reserved-percent=" on a Rhel 6 kickstart
2. run ksvalidator -v RHEL6 /location/of/kickstart


Actual results:
no such option: --reserved-percent

Expected results:
--reserved-percent is a valid option. 

Additional info:
This is a valid option for RHEL 7 kickstart as well. Thus, running ksvalidator against the kickstart without specifying the version will work (So long as no removed options are used)

Just a bit more info:

This does work properly in 1.74 (the version in RHEL6).  The validation function for volgroup differs between these versions:

From volgroup.py v.1.74:
 class RHEL6_VolGroup(F16_VolGroup):

And from v.1.99:
 class RHEL6_VolGroup(FC3_VolGroup):

FC16_VolGroup inherits from FC3_VolGroup and adds "--reserved-percent" as a valid option.  Using FC16_VolGroup in 1.99 allows it to work as expected (as well as adjusting the parse line later in the function).

Needs a cherry-pick of 207ca9a5f371415096a2a3f3d9d88798a7ecd9ef.

FYI: One of my coworkers submitted a patch for this issue which was merged in the upstream project:

https://github.com/rhinstaller/pykickstart/pull/53

Ah I see that is the commit that was referred to.  Awesome, sorry for the noise.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2184.html