test-subrepo-svn: restore expr functionality for solaris
Cleanup in
22f3353bcc36 removed a syntactically incorrect and apparently
unnecessary escape of / for expr - but solaris needs it.
test-serve: fix test for binding to low named port on solaris
Solaris do not know the service called http, so we use echo instead.
Trying to define KILLQUIETLY when running the hgserve function didn't set the
value within the function. Now we set the variable before calling the function.