another cleanup JIRA

[Bruce Schuchardt]

Geode-72 <https://issues.apache.org/jira/browse/GEODE-72> calls for 
removing rolling upgrade code for old GemFire releases. There's no 
reason for Geode code to be cluttered up with rolling upgrade code for 
old GemFire releases since you won't be able to do a rolling upgrade 
from those releases to Geode due to package renaming.