[mythtv] %DIR% variable does not expand properly in new EventCmdRecStarted

[Bryan Mayland]

I've tried setting a value for the excellent new EventCmdRecStarted 
event, but the %DIR% variable does not expand properly.  It looks like 
the file doesn't exist on the disk yet so it expands to:
/GetPlaybackURL/UNABLE/TO/FIND/LOCAL/FILE/ON/hostname

The file does exist when I check it manually or at the RecFinished 
event, it is just a race between the recorder creating the file and the 
recstarted event looking for it.

While I was looking at this with VB_FILE on, I've also noticed it checks 
the paths for the "Default" storage group on every host for the file.  
Shouldn't it only check the local storage group directories when looking 
for a local file?
libs/libmyth/programinfo.cpp:1725
<  StorageGroup sgroup(storagegroup);
 >  StorageGroup sgroup(storagegroup, gContext->GetHostName());