Fix bundle override in ManageIQ::Environment

Commit 04d9a75 overrides Travis' built-in bundle install, which handles
bundle caching as well as parallel installs and retries, but did so
without any of those feature causing them to be lost in all of the
provider repos.

http://talk.manageiq.org/t/can-we-speed-up-small-repos-on-travis/2533

lib/manageiq/environment.rb

@@ -52,13 +52,19 @@ def self.install_bundler
     end
 
     def self.bundle_install(root = APP_ROOT)
-      system('bundle check', :chdir => root) || system!('bundle install', :chdir => root)
+      system("bundle check", :chdir => root) ||
+        system!("bundle install #{bundle_params}", :chdir => root)
     end
 
     def self.bundle_update(root = APP_ROOT)
-      system!('bundle update', :chdir => root)
+      system!("bundle update #{bundle_params}", :chdir => root)
     end
 
+    def self.bundle_params
+      "--jobs=3 --retry=3 --path=${BUNDLE_PATH:-vendor/bundle}" if ENV['CI']
+    end
+    private_class_method :bundle_params
+
     def self.create_database
       puts "\n== Updating database =="
       run_rake_task("db:create")