Change email address of Trafodion Firefighters

Change the email address of Trafodion Firefighters back to the
@hp.com list so someone will take a look at results of the daily
builds.

The email address will be changed back to the Launchpad list
once the service accounts (jenkins, zuul, etc.) are able to verify
their email with Launchpad.

Change-Id: I2f955054fbcffa12366daa198bf1f29833ae8cb9