Update buffering strategy for redhat security feed.

7 jobs for master in 6 minutes and 9 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Syntax
passed #1550
ruby
jruby_1.7

00:02:59

passed #1551
ruby
jruby_9.1

00:03:05

passed #1546
ruby
ruby_2.1

00:00:40

passed #1547
ruby
ruby_2.2

00:01:21

passed #1548
ruby
ruby_2.3

00:03:10

passed #1549
ruby
ruby_2.4

00:01:13

 
  Linting
failed #1552
ruby
rubocop

00:02:56

 
Name Stage Failure
failed
rubocop Linting There is an unknown failure, please try again
Successfully installed unicode-display_width-1.3.0
Successfully installed rubocop-0.53.0
8 gems installed
$ rubocop -l -f simple --except RescueException,Eval,AssignmentInCondition,ScriptPermission
== plugins/redhatsecurity.rb ==
W: 49: 9: Lint/UselessAssignment: Useless assignment to variable - items.

55 files inspected, 1 offense detected
ERROR: Job failed: exit code 1