Use default parallel_tests grouping

The default is

> default - runtime when runtime log is filled otherwise filesize

This will make it easier to switch to using previous runtimes for
splitting tests.

bundler/script/ci-test

@@ -3,7 +3,7 @@
 set -e
 
 bundle install
-bundle exec parallel_test spec/ --group-by filesize --type rspec --verbose
+bundle exec parallel_test spec/ --type rspec --verbose
 
 # NOTE: Don't use `if` branches without `else` part, since the code in some of
 # then seems to not abort the script regardless of `set -e`

composer/script/ci-test

@@ -3,4 +3,4 @@
 set -e
 
 bundle install
-bundle exec parallel_test spec/ --group-by filesize --type rspec --verbose
+bundle exec parallel_test spec/ --type rspec --verbose

go_modules/script/ci-test

@@ -3,4 +3,4 @@
 set -e
 
 bundle install
-bundle exec parallel_test spec/ --group-by filesize --type rspec --verbose
+bundle exec parallel_test spec/ --type rspec --verbose

hex/script/ci-test

@@ -3,4 +3,4 @@
 set -e
 
 bundle install
-bundle exec parallel_test spec/ --group-by filesize --type rspec --verbose
+bundle exec parallel_test spec/ --type rspec --verbose

npm_and_yarn/script/ci-test

@@ -4,7 +4,7 @@ set -e
 
 bundle install
 export YARN_ENABLE_IMMUTABLE_INSTALLS=false yarn
-bundle exec parallel_test spec/ --group-by filesize --type rspec --verbose
+bundle exec parallel_test spec/ --type rspec --verbose
 
 # Should we only run these on one of the CI_NODE_INDEX's?
 cd /opt/npm_and_yarn && npm run lint && cd -

python/script/ci-test

@@ -5,4 +5,4 @@ set -e
 pyenv exec flake8 helpers/. --count --exclude=./.*,./python/spec/fixtures --show-source --statistics
 
 bundle install
-bundle exec parallel_test spec/ --group-by filesize --type rspec --verbose
+bundle exec parallel_test spec/ --type rspec --verbose

swift/script/ci-test

@@ -3,4 +3,4 @@
 set -e
 
 bundle install
-bundle exec parallel_test spec/ --group-by filesize --type rspec --verbose
+bundle exec parallel_test spec/ --type rspec --verbose