Revert "Revert "CA-112880: Fix race condition writing memory-actual""

This reverts commit 14a1f16e0a26305f7f5211d5aeb102b8515eec49.
CA-112880: Always update RRD sources

Before this change the update_named call was only happening when values had
been changed as a result of commit f0f94eb introducing an if which affected the
semantics.

This should fix that.

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Merge pull request #1683 from simonjbeaumont/ca-112880-fix-fix

[SANIBEL] HFX-1030: Fix wrong memory display (corrected)