Add further info about Gerrit at SAP
Add further info about Gerrit at SAP

Add slide that explains why SAP uses Gerrit, reword contributions to
JGit and EGit, add hardware details for second Gerrit instance.

Change-Id: I43841dfa76e1455443717bccf8923fb1ec0bcb78
Signed-off-by: Edwin Kempin <b444e279ad95fdef4fbdd82c813b624595df204a@sap.com>

GerritCodeReview/training_gerrit