Merge branch 'pw/git-p4'

Various "git p4" updates. * pw/git-p4: git p4 doc: use two-line style for options with multiple spellings git p4 test: examine behavior with locked (+l) files git p4: fix an error message when "p4 where" fails git p4: handle files with wildcards when doing RCS scrubbing git p4 test: do not pollute /tmp git p4 test: run as user "author" git p4 test: is_cli_file_writeable succeeds git p4 test: explicitly check p4 wildcard delete git p4: work around p4 bug that causes empty symlinks git p4 test: ensure p4 symlink parsing works git p4 test: wildcards are supported