FENNEL: If ExecStreamGovernor deleted still holding resources, trace as SEVERE but don't assert.
FENNEL: If ExecStreamGovernor deleted still holding resources, trace as SEVERE but don't assert.

[git-p4: depot-paths = "//open/dt/dev/": change = 12962]

LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb