myjenkins: Update plugins as of 2017-05-25
myjenkins: Update plugins as of 2017-05-25

* ghprb:1.37.0
* git-client:2.4.6

Signed-off-by: Gianpaolo Macario <d50c09b51e61901a1c5054dce86f92776c198faa@mentor.com>
gmacario/easy-jenkins