jiri-test/internal/test: use v23agentd instead of agentd in regression test
jiri-test/internal/test: use v23agentd instead of agentd in regression test

Change-Id: I92b597dce2a37e3853810a7dcdbb17574ddb1659

vanadium/go.devtools,vanadium/go.devtools,vanadium/go.devtools