Clark Boylan c882808578 Remove container image builds for old gerrit versions
Having upgraded to 3.2, we don't need these versions any more.

Change-Id: Ifc37a75aa62b2498e649a4c81b589a04c794184a
Depends-On: https://review.opendev.org/763617
2020-11-21 13:58:19 -08:00
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