retry maven deployment failures due to network issues

[itsankit-google]

ref: https://maven.apache.org/plugins/maven-deploy-plugin/examples/deploy-network-issues.html

context: cdap-build often fails on maven deploy step due to network failures.

example:

Failed to execute goal org.sonatype.plugins:nexus-staging-maven-plugin:1.6.2:deploy (injected-nexus-deploy) on project cdap-hbase-compat-1.1: Failed to retrieve remote metadata io.cdap.cdap:cdap-hbase-compat-1.1:6.9.5-SNAPSHOT/maven-metadata.xml: Could not transfer metadata io.cdap.cdap:cdap-hbase-compat-1.1:6.9.5-SNAPSHOT/maven-metadata.xml from/to sonatype.snapshots (https://oss.sonatype.org/content/repositories/snapshots): Transfer failed for https://oss.sonatype.org/content/repositories/snapshots/io/cdap/cdap/cdap-hbase-compat-1.1/6.9.5-SNAPSHOT/maven-metadata.xml 502 Bad Gateway -> [Help 1]