Upgrade cassandra to version 3.11.2 (2/3)

- upgrade cassandra package to 3.11.2
- remove dependency on jdk 1.8.0.151 in puppet files

Change-Id: I3894dfdb688a21451866af2bb201c7f9ae8fb721
Depends-On: I45cd32dc6a7bc87295de941e7e6131c5308b539f
Partial-Bug: #1776656

playbooks/roles/cassandra/defaults/main.yml

@@ -1,8 +1,8 @@
 ---
 # defaults file for ansible-role-cassandra
 cassandra_distro: dsc
-cassandra_version: '3.10'
-cassandra_version_branch: '3.10'
+cassandra_version: '3.11.2'
+cassandra_version_branch: '3.11.2'
 update_java_alternatives: false
 cassandra_packages: "{{ ['cassandra', 'opscenter'] }}"