[SPARK-6568] spark-shell.cmd --jars option does not accept the jar that has space in its path

escape spaces in the arguments.

Author: Masayoshi TSUZUKI <tsudukim@oss.nttdata.co.jp>

Closes #5347 from tsudukim/feature/SPARK-6568 and squashes the following commits:

9180aaf [Masayoshi TSUZUKI] [SPARK-6568] spark-shell.cmd --jars option does not accept the jar that has space in its path