HDDS-2071. Support filters in ozone insight point

[elek]

What changes were proposed in this pull request?

Extent the existing ozone insight command with support additional log filtering. For example if you are interested about

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-2071

How was this patch tested?

#start a cluster
cd hadoop-ozone/dist/target/ozone-*/compose/ozone
docker-compose up -d --scale datanode=3

# go to scm
docker-compose exec scm bash

insight without filter (wait until the next node report, ~ 30 s)

ozone insight logs -v scm.node-manager

#Example output
[SCM] 2019-10-13 08:34:29,920 [TRACE|org.apache.hadoop.hdds.scm.node.SCMNodeManager|SCMNodeManager] HB is received from [datanode=ozone_datanode_2.ozone_default]: 
storageReport {
  storageUuid: "DS-36d38c09-4306-4a30-b48c-b3b612d4eb00"
  storageLocation: "/data/hdds"
  capacity: 485541425152
  scmUsed: 4096
  remaining: 128080560128
  storageType: DISK
  failed: false
}

insight WITH filter (wait until the next node report, ~ 30 s)

ozone insight logs -v scm.node-manager -f datanode=ozone_datanode_2.ozone_default

You should see only the node reports from datanode_2

[xiaoyuyao]

+1, Thanks @elek for adding this and @adoroszlai for the reviews.