add gem 'activesupport' to fix lkp error

When running lkp split-job, there will be an error log:
-----
cfan@lkp-boy:~/lkp/lkp-tests$ sudo lkp split-job jobs/pack-deps.yaml
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire':
cannot load such file -- active_support/core_ext/enumerable
dError)
        from
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire'
        from /home/cfan/lkp/lkp-tests/lib/array_ext.rb:3:in `<top
(required)>'
        from
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire'
        from
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire'
        from /home/cfan/lkp/lkp-tests/lib/common.rb:9:in `<top
(required)>'
        from
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire'
        from
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire'
        from /home/cfan/lkp/lkp-tests/lib/job.rb:6:in `<top
uired)>'
        from
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire'
        from
/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
uire'
        from /home/cfan/lkp/lkp-tests/sbin/split-job:5:in `<main>'
-----

The reason is lack of 'activesupport', so add it to fix the error.

Signed-off-by: Chao Fan <fanx.chao@intel.com>
Signed-off-by: Xu Chao <chaox.a.xu@intel.com>
Signed-off-by: Philip Li <philip.li@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/Gemfile b/Gemfile
index c2e01d6e..09180034 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,3 +15,5 @@ group :test do
   gem 'simplecov'
   gem 'simplecov-rcov'
 end
+
+gem 'activesupport'