Remove trailing spaces (#665)

* Remove trailing spaces

* PR-665 -  Remove trailing spaces

- Updated not stable test t/pt-online-schema-change/preserve_triggers.t
- Updated utilities in bin directory

* PR-665 -  Remove trailing spaces

- Fixed typos

* PR-665 -  Remove trailing spaces

- Fixed typos

---------

Co-authored-by: Sveta Smirnova <sveta.smirnova@percona.com>

bin/pt-mext

@@ -328,7 +328,7 @@ _eval_po() {
             *)
                echo "Invalid attribute in $opt_spec: $line" >&2
                exit 1
-         esac 
+         esac
       done < "$opt_spec"
 
       if [ -z "$opt" ]; then
@@ -471,7 +471,7 @@ _parse_command_line() {
             if [ "$val" ]; then
                option_error "Option $real_opt does not take a value"
                continue
-            fi 
+            fi
             if [ "$opt_is_negated" ]; then
                val=""
             else