Add 6.x job to Jenkins

Author: sethmlarson

.ci/jobs/elastic+elasticsearch-py+6.x.yml

@@ -0,0 +1,12 @@
+---
+- job:
+ name: elastic+elasticsearch-py+6.x
+ display-name: 'elastic / elasticsearch-py # 6.x'
+ description: Testing the elasticsearch-py 6.x branch.
+ junit_results: "*-junit.xml"
+ parameters:
+ - string:
+ name: branch_specifier
+ default: refs/heads/6.x
+ description: the Git branch specifier to build (<branchName>, <tagName>,
+ <commitId>, etc.)