Update preferred ruby dev version to match SLE12 release
Update preferred ruby dev version to match SLE12 release

2.1.2 -> 2.1.9

vitoravelino/velum,ereslibre/velum,MaximilianMeister/velum,ereslibre/velum,vitoravelino/velum,MaximilianMeister/velum,kubic-project/velum,vitoravelino/velum,vitoravelino/velum,kubic-project/velum,kubic-project/velum,MaximilianMeister/velum,ereslibre/velum,ereslibre/velum,kubic-project/velum,MaximilianMeister/velum