Revert "MB-11873: Revert "fixed remote_clusters_info... gc-ing""

This reverts commit 85c22e404bf70bb36baadcedecedbb6cb61dda36.

This revers the revert of commit:
f7fe5469015fdd19fc58cf70f896d922a45daa0d

After true MB-11873 fixes we can now return fix for
remote_clusters_info gc-ing.

Change-Id: Icd603fac1c65c85841104ebc1372af9a6b15fd91
Reviewed-on: http://review.couchbase.org/40275
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>