[SPARK-8596][EC2] Added port for Rstudio

[koaning]

This would otherwise need to be set manually by R users in AWS.

https://issues.apache.org/jira/browse/SPARK-8596

[AmplabJenkins]

Can one of the admins verify this patch?

[shivaram]

Jenkins, add to whitelist

[shivaram]

Jenkins, ok to test

[shivaram]

Really minor but could you add a comment on the line before saying this is for RStudio ? Might help others figure out why this port is open

[AmplabJenkins]

Merged build triggered.

[AmplabJenkins]

Merged build started.

[SparkQA]

Test build #35945 has started for PR 7068 at commit ce6ad88.

[SparkQA]

Test build #35945 has finished for PR 7068 at commit ce6ad88.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Merged build finished. Test FAILed.

[AmplabJenkins]

Merged build triggered.

[AmplabJenkins]

Merged build started.

[koaning]

@shivaram. Comment might make sense (I didn't add because most ports didn't have comments).

Comment added.

[SparkQA]

Test build #35946 has started for PR 7068 at commit ac8100d.

[SparkQA]

Test build #35946 has finished for PR 7068 at commit ac8100d.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Merged build finished. Test FAILed.

[koaning]

just out of curiosity. what is making this test fail?

[shivaram]

The tests are not actually failing. The message from SparkQA is the one to use (it says passes all tests). There is a bug in the AmplabJenkins messages that @JoshRosen is looking into.

LGTM. Thanks @koaning for the patch. Merging this