SPARK_LOGFILE and SPARK_ROOT_LOGGER no longer need in spark-daemon.sh

Author: wangfei <wangfei_hello@126.com>

Closes #2057 from scwf/patch-7 and squashes the following commits:

1b7b9a5 [wangfei] SPARK_LOGFILE and SPARK_ROOT_LOGGER no longer need in spark-daemon.sh

(cherry picked from commit a1e8b1bc973bc0517681c09e5a5a475c0f395d31)
Signed-off-by: Andrew Or <andrewor14@gmail.com>