A migratable service could fail to come up on every possible
configured server. This attribute controls how many further
attempts, after the service has failed on every server at least
once, should be tried. Note that each attempt specified here
indicates another full circut of migrations amongst all the
configured servers. So for a 3-server cluster, and a value of 2, a
total of 4 additional migrations will be attempted. (the original
server is never a valid destination)
(Interface=weblogic.management.configuration.SingletonServiceBaseMBean Attribute=getAdditionalMigrationAttempts)