[Pacemaker] Slight change to the mailing list

[Andrew Beekhof]

Hi,

During the migration the List-ID header for this list was changed from  
pacemaker.clusterlabs.org to pacemaker.oss.clusterlabs.org

For anyone not using procmail this is unlikely to mean anything at  
all, but I'm told it is common to use List-ID to sort mail into folders.
Anyone doing this probably had their setup broken by this change -  
sorry.

The good news for those people is that it wont be changing again.

Apologies for the inconvenience,
Andrew