Add "How to" for changing the default H2O port

[exalate-issue-sync]

For PySparkling and Sparkling Water, we can use the corresponding getters:
{code}
bin/sparkling-shell --conf "spark.ext.h2o.client.web.port=443"
{code}

In RSparkling we do not have setters and getters exposed so we need to specify that directly:
{code}
config=spark_config()
config=c(config,list("spark.ext.h2o.node.port.base"="55555", "spark.ext.h2o.client.port.base"="44444"))
sc <- spark_connect(master="yarn-client",app_name = "sparklyr",config = config )
{code}

[DinukaH2O]

JIRA Issue Migration Info

Jira Issue: SW-753
Assignee: Angela Bartz
Reporter: Angela Bartz
State: Resolved
Fix Version: 2.0.25
Attachments: N/A
Development PRs: Available

Linked PRs from JIRA

#600

[hasithjp]

JIRA Issue Migration Info Cont'd

Jira Issue Created Date: 2018-03-07T10:56:36.388-0800