add explicit username to search proper gpg key
add explicit username to search proper gpg key


Former-commit-id: cfdc6f4bf0fcc4706794eba896b98a333c661f3c [formerly d9f10930f0bc5446aae4bffd9b482421711c6647]
Former-commit-id: 2a5fe9fd8f0a385ad88dd15f962f737798b34b16
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine