feat: Merging 1.15 to master

This reverts commit 3869ce00.

This reverts commit e6fb1b96.

* Issue #000 cqlsh: cassandra  with multiple hosts

Issue #000 heap: getting the heap size of server dynamicly and having a provision to override (#490)

* Issue #000 vars: grafana url changes

* Issue #000 heap: getting the heap size of server dynamicly and having a provision to override (#489)

* Issue #000 host: default variable for content preview

* Issue #000 heap: taking the heap size of elasticsearch as dynamic and having a provision to override

* Issue #000 host: default variable for content preview

* Issue #000 host: default variable for content preview

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: change trampoline secret

* Issue #000 host: cdn url changes

* Issue #000 host: default variable for heap size

* Issue #000 host: default variable for heap size

* Issue #000 host: default variable for heap size

* Issue #000 host: default variable for heap size

* Issue #000 host: es changes

* Issue #000 host: vars updation

* Issue #000 host: vars updation

* Issue #000 host: vars updation

* Issue #000 host: vars updation

* Issue #000 host: taking ram dynamicly

* es fix

* es fix

* es fix

* Issue #000 es: make the es run the mappings in the initial time

* Issue #000 es: Test es command

* Issue #000 es: run curl command

* Issue #000 es: run curl command

* Issue #000 es: run curl command with changes

* feat: Changes to jenkins configs and setup scripts

* fix: Fixing some configs for Jenkinsfile

* fix: fixes to Jenkins file configs

* fix: Jenkinsfiles of release-1.15

* Issue #000 feat: added es6 role

* Issue #SB-7680 chore: Added keycloak package deployment script

* added grafana-backup playbook
* Update jenkins-backup.yml

Ansible updated to plugin deploy

Update path

Ansible playbook for plugins deploy

* Issue #000 code: changing mount point for promDB to be persistent,adding a default mount point for promDB to be persistent,adding a default with /root for promDB,added a default value in all.yml file, creating a directory for prometheus to work, changed the prometheus retention time to 3 days in terms of hours, monitoring grafana root webiste URL changes for adding users

 updated logic to get latest tag

* Issue #000 feat: changing apk to apt

* Issue #000 feat: changing alpine to slim for portal cdn build

* Issue #000 feat: disabling jessie updates

* Issue #000 feat: auto accepting player builds

* fix: Updating role to openjdk
* adding sunbird_gzip_size_threshold

* Issue #000 vars: monitoring prometheus and alertmanager incorrect yaml syntax fix

* Iisue #000 vars: change in port for node-exporter

* Update main.yml

* Update keycloak.yml

* Update main.yml

* Update keycloak.yml

* Update main.yml

* Issue #000 feat: Adding cdn build
* Issue #000 feat: removing apt install azure cli dep from assets-upload