Correctly check for implicit 2PC.
Correctly check for implicit 2PC.

Now we have far more information embedded in the GID string. So there is no
point looking for [0-9]+ pattern beyond the prefix. Just assume external tools
would never use that pattern (PREPARE TRANSACTION should anyway throw an error
if they try to use the pattern)

zeroae/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl,zeroae/postgres-xl