Revert "Make sure to use specific version of multi_test gem"

Version 1.1.0 of multi_test re-adds the disable_autorun feature.

This reverts commit 493832e.

op5build/ci_config.yml

@@ -26,7 +26,6 @@ post:
 
     # Install requirements for cucumber test
     gem install --no-ri --no-rdoc \
-        multi_test:0.1.2 \
         cucumber:1.3.18 \
         rspec:2.14.1 \
         parallel:1.13.0 \
@@ -35,12 +34,6 @@ post:
         sequel \
         mysql2
 
-    # Uninstall unwanted dependency gems from cucumber installation.
-    # Todo: We should upgrade cucumber to version 3.2.0 so that we use the same
-    # version throughout our repos.
-    gem uninstall multi_test -v 1.0.0
-
-
     # Run cucumber tests
     ulimit -c unlimited
     mkdir -p /mnt/logs