repo status shows recent manifest entries as untracked

[Al Bailey]

Brief Description
-----------------
'repo status' shows

 -- stx/app-kubevirt/
 -- stx/app-sts-silicom/

which means that 2 new entries were added to the manifest, but the .gitignore was not updated.

The 2 manifest entries were:
https://review.opendev.org/c/starlingx/manifest/+/858540
https://review.opendev.org/c/starlingx/manifest/+/860115

Both reviews contained a comment indicating that the authors should have updated the following file:

https://github.com/starlingx/root/blob/master/stx/.gitignore

Severity
--------
Minor

Steps to Reproduce
------------------
repo sync
repo status

Expected Behavior
------------------
repo status should only show your local changes

Actual Behavior
----------------
the 2 new manifests show up as untracked changes

Reproducibility
---------------
100%

System Configuration
--------------------
N/A

Branch/Pull Time/Commit
-----------------------
After those 2 manifest changes merged.
Sept 23rd for app-sts-silicom
Oct 4th the app-kubevirt

Last Pass
---------
Sept 22

Timestamp/Logs
--------------
N/A

Test Activity
-------------
Development

Workaround
----------
None needed. its purely cosmetic

[Al Bailey (albailey1974)]

Fixed by https://review.opendev.org/c/starlingx/root/+/861656