Make it possible to select or deselect test groups by number

Examples of possible expressions (adapt to your platform):

    make test TESTS=-99
    make test TESTS=10
    make test TESTS=-9?
    make test TESTS=-[89]0
    make test TESTS=[89]0

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2887)

test/run_tests.pl

diff --git a/test/run_tests.pl b/test/run_tests.pl
index 66697db..9c5ade1 100644
--- a/test/run_tests.pl
+++ b/test/run_tests.pl
@@ -86,5 +86,8 @@
 sub find_matching_tests {
     my ($glob) = @_;
 
+    if ($glob =~ m|^[\d\[\]\?\-]+$|) {
+        return glob(catfile($recipesdir,"$glob-*.t"));
+    }
     return glob(catfile($recipesdir,"*-$glob.t"));
 }