Add ability to inspect the ISO for kickstart logging

[Fryguy]

@bdunne Please review.

Expected usage is that if someone doesn't want kickstart logging, they can pass --no-ks-log to vmbuild

I intentionally made the iso_modified.sh a shell script to mirror iso_modify.sh. That way after someone manually changes it with iso_modify.sh, they can check it with iso_modified.sh in a similar way.

As dicsussed, I've changed the iso_modify.sh to first check if modified, and then we just always call it from the build. Specific modifications can be opted out with ENV vars.

Backport to morphy depends on https://github.com/ManageIQ/manageiq-appliance-build/pull/495

[Fryguy]

@bdunne I've updated it as discussed. Can you take another look?

[Fryguy]

Backported to morphy in commit 4e58f32c8682f52089341489113fdda901f308fe.

commit 4e58f32c8682f52089341489113fdda901f308fe
Author: Brandon Dunne <brandondunne@hotmail.com>
Date:   Fri Jan 7 13:55:53 2022 -0500

    Merge pull request #499 from Fryguy/ensure_kickstart_logging_disabled

    Add ability to inspect the ISO for kickstart logging

    (cherry picked from commit 9cd805052f46282e38134920582c85d52ffaaed0)

[Fryguy]

@Fryguy A conflict occurred during the backport of this pull request to lasker.

If this pull request is based on another pull request that has not been marked for backport, add the appropriate labels to the other pull request. Otherwise, please create a new pull request direct to the lasker branch in order to resolve this.

Conflict details:

diff --cc config/base.tdl.erb
index 87e85a4,e49297a..0000000
--- a/config/base.tdl.erb
+++ b/config/base.tdl.erb
@@@ -6,7 -6,7 +6,11 @@@
      <version>4</version>
      <arch>x86_64</arch>
      <install type="iso">
++<<<<<<< HEAD
 +      <iso>file:///build/isos/CentOS-Stream-8-x86_64-20210608-dvd1.iso</iso>
++=======
+       <iso>file://<%= ISO_FILE.to_s %></iso>
++>>>>>>> 9cd8050 (Merge pull request #499 from Fryguy/ensure_kickstart_logging_disabled)
      </install>
    </os>
    <description>CentOS TDL meant to be used with custom kickstart for manageiq.</description>
* Unmerged path bin/iso_modify.sh

[Fryguy]

@Fryguy A conflict occurred during the backport of this pull request to lasker.

If this pull request is based on another pull request that has not been marked for backport, add the appropriate labels to the other pull request. Otherwise, please create a new pull request direct to the lasker branch in order to resolve this.

Conflict details:

diff --cc config/base.tdl.erb
index 87e85a4,e49297a..0000000
--- a/config/base.tdl.erb
+++ b/config/base.tdl.erb
@@@ -6,7 -6,7 +6,11 @@@
      <version>4</version>
      <arch>x86_64</arch>
      <install type="iso">
++<<<<<<< HEAD
 +      <iso>file:///build/isos/CentOS-Stream-8-x86_64-20210608-dvd1.iso</iso>
++=======
+       <iso>file://<%= ISO_FILE.to_s %></iso>
++>>>>>>> 9cd8050 (Merge pull request #499 from Fryguy/ensure_kickstart_logging_disabled)
      </install>
    </os>
    <description>CentOS TDL meant to be used with custom kickstart for manageiq.</description>