WIP : Temporarily remove all mattermost postgresql changes from bigbang...

WIP : Temporarily remove all mattermost postgresql changes from bigbang mergeback to see if mysterious package failures continue

# This is a combination of 2 commits.
# This is the 1st commit message:

# This is a combination of 5 commits.
# This is the 1st commit message:

Revert "Change security context UID/GID references to 1001"

This reverts commit 6a5663a5.

# This is the commit message #2:

Revert "Mattermost #155: Correct pod security context settings for postgresql primary"

This reverts commit f3bf748f.

# This is the commit message #3:

Revert "Mattermost #155: Correct pod security context settings for postgresql primary"

This reverts commit f0edb1c3.

# This is the commit message #4:

Revert "Mattermost #155: Force mattermost chart template to properly manage postgresql values"

This reverts commit c204cf8d.

# This is the commit message #5:

Revert "Mattermost #155: Add runAsGroup for mattermost postgresql security context"

This reverts commit a1004a1b.

# This is the commit message #2:

Revert "Updated mattermost git tag"

This reverts commit 16c41017.