NAS-133074 / 24.10.2 / always reinitialize pwenc in vrrp_backup (by yocalebo)

[bugclerk]

Automatic cherry-pick failed. Please resolve conflicts by running:

git reset --hard HEAD~1
git cherry-pick -x c8bf9f39fa83910e9ff05cf9414cb946ad47e478
git cherry-pick -x 08c0e41cb028b8836c3236d16da85d3d1e192a0e
git cherry-pick -x eceefedc1018b4438e4a6d3955ba375a86b6ea97

If the original PR was merged via a squash, you can just cherry-pick the squashed commit:

git reset --hard HEAD~1
git cherry-pick -x 148f5f4ade9991e5ddc352c581fe003453819dc2

QE has hit a rather rare, but painful, error whereby the secret seed between the controllers didn't match. To remedy this problem, we take the approach to always sync the pwenc_secret file from the active controller in the backup function. This ensures they stay in sync with one another.

Original PR: #15204
Jira URL: https://ixsystems.atlassian.net/browse/NAS-133074