[UIMA-3251][UIMA-3247] sign and checksum the source-release.zip, revert to 7-SNAPSHOT for redoing release try.
[UIMA-3251][UIMA-3247] sign and checksum the source-release.zip, revert to 7-SNAPSHOT for redoing release try.

git-svn-id: 71fdd81d427d1664ceef220cd41fb697a2614719@1520367 13f79535-47bb-0310-9956-ffa450edef68

apache/uima-build,apache/uima-build,apache/uima-build