test-init: replace 'echo -n' with 'printf'
The '-n' argument to echo is a non-standard extension that isn't
supported on Mac OS X 10.6.
% hg debugsub with no remapping
path sub
source http://example.net/libfoo
revision
% hg debugsub with remapping
path sub
source ssh://localhost/libfoo
revision
% test bad subpaths pattern
abort: bad subrepository pattern in $HGTMP/test-subrepo-paths/outer/.hg/hgrc:2: invalid group reference