pt-summary for 2.1, also changes to pt-mysql-summary from Daniel's review

util/test-bash-functions

@@ -136,6 +136,16 @@ skip() {
    fi
 }
 
+# TODO unperlify
+like() {
+   local got="$1"
+   local regex="$2"
+   local test_name=${3:-""}
+   test_command="$got =~ m<$regex>"
+   perl -e 'exit(scalar($ARGV[0] =~ m<^$ARGV[1]>msi ? 0 : 1))' "$got" "$regex"
+   result $? "$test_name"
+}
+
 no_diff() {
    local got=$1
    local expected=$2