streamchain

Retire maintainers that have been dormant for the past 6+ months:
Jim Zhang
Yaoguo Jiang

Fabric policy:
Maintainers may be removed "for prolonged inactivity (3 or more months)".

"A maintainer removed for inactivity should be restored following a
sustained resumption of contributions and reviews (a month or more)
demonstrating a renewed commitment to the project."

FAB-11272 #done

Change-Id: I4718756c3107a2e2480801b7d2e9a4510704296c
Signed-off-by: David Enyeart <enyeart@us.ibm.com>