Expand user's home directory when looking up the .gnupg directory in prepare_release_candidate.py
Expand user's home directory when looking up the .gnupg directory in
prepare_release_candidate.py

strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test