Update driver-pravega after 0.8.0 Pravega release

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Update omb driver-pravega after 0.8.0 Pravega release

1. Change controller.zk.url to controller.zk.connect.uri in templates/controller.config.properties

[root@W10J6T4733 deploy]# grep -r "controller.zk.url" *
templates/controller.config.properties:controller.zk.url={{ zookeeperServers }}

2. Change io.pravega:pravega-client version from 0.7.1 to 0.8.0 in driver-pravega/pom.xml

<!-- https://mvnrepository.com/artifact/io.pravega/pravega-client -->
 <dependency>
    <groupId>io.pravega</groupId>
    <artifactId>pravega-client</artifactId>
    <version>0.8.0</version>
  </dependency>

3. Change pravegaVersion and update zookeeper(optional), bookkeeper and prometheus(optional) versions in driver-pravega/deploy/vars.yaml

---
pravegaVersion: "0.8.0"
zookeeperVersion: "3.6.1"
bookkeeperVersion: "4.9.2"
prometheusVersion: "2.18.1"
pravegaContainersPerSegmentStore: 8

4. Use official Pravega tester image in driver-pravega/deploy/deploy.yaml Run Pravega Tester task Use official Pravega tester image #35

5. Use Pravega official graphana image with Pravega dashboards instead of currently grafana/grafana:latest

• Add automatic InfluxDB datasource adding to grafana.

5. Update properties in driver-pravega/deploy/templates directory
   However, seems after Issue 4712 breaking properties changes, we need to update all affected properties in driver-pravega
   Otherwise, we can have problems with deployment or f.e metrics collecting

Issue 4712: Inconsistently and confusingly named configuration keys #4712
pravega/pravega#4712
Issue 4900: Fix configuration related issues in templates and docs #4905
pravega/pravega#4905

Refer to Configuration Naming Guidelines
https://github.com/pravega/pravega/wiki/Configuration-Naming-Guidelines

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May be we can fix license check warnings by adding license headers?

[WARNING] Missing header in: C:/DELL_EMC/Development/OMB/pravega-omb/driver-pulsar/deploy/templates/chrony.conf
[WARNING] Missing header in: C:/DELL_EMC/Development/OMB/pravega-omb/driver-kafka/deploy/templates/chrony.conf
[WARNING] Missing header in: C:/DELL_EMC/Development/OMB/pravega-omb/driver-pravega/deploy/templates/bkenv.sh
...

-Dlicense.skip=true is the com.mycila plugin flag to skip checks, see "Request for a skip check goal. #28" mathieucarbou/license-maven-plugin#28 closed in 2013, so think it will work.
In omb com.mycila.license-maven-plugin:3.0 is used for checking license headers:

<plugin>
	<groupId>com.mycila</groupId>
	<artifactId>license-maven-plugin</artifactId>
	<version>3.0</version>
...