SPARK-1879. Increase MaxPermSize since some of our builds have many classes

See https://issues.apache.org/jira/browse/SPARK-1879 -- builds with Hadoop2 and Hive ran out of PermGen space in spark-shell, when those things added up with the Scala compiler.

Note that users can still override it by setting their own Java options with this change. Their options will come later in the command string than the -XX:MaxPermSize=128m.

Author: Matei Zaharia <matei@databricks.com>

Closes #823 from mateiz/spark-1879 and squashes the following commits:

6bc0ee8 [Matei Zaharia] Increase MaxPermSize to 128m since some of our builds have lots of classes

(cherry picked from commit 5af99d7617ba3b9fbfdb345ef9571b7dd41f45a1)
Signed-off-by: Tathagata Das <tathagata.das1565@gmail.com>