Move successful chart fetch signal to reconcile
Move successful chart fetch signal to reconcile

As the chart source getter methods are used in other places, e.g.
to compare the values checksums, and the condition update causes
the `LastUpdateTime` to renew.

Given this `LastUpdateTime` timestamp is used to determine if an
upgrade should be hold back for rolled back releases, it would
corrupt the 'state machine' and give a false positive, causing a
infinite loop of rollback-release.

weaveworks/flux,weaveworks/flux