Different permission of phoenix-*-queryserver.log from umask

The permission of phoenix-*-queryserver.log is different from umask we set.

For example, when we set umask to 077, the permission of phoenix-*-queryserver.log should be 600, but it's 666:

$ umask 077
$ <phenix-home>/bin/queryserver.py start
starting Query Server, logging to /var/log/hbase/phoenix-hbase-queryserver.log
$ ll /var/log/hbase/phoenix*
-rw-rw-rw- 1 hbase hadoop 6181 Nov 27 13:52 phoenix-hbase-queryserver.log
-rw------- 1 hbase hadoop 1358 Nov 27 13:52 phoenix-hbase-queryserver.out

It looks like the permission of phoenix-*-queryserver.out is correct (600).

queryserver.py opens QueryServer process as a sub process but it looks like the umask is not inherited. I think we need to inherit the umask to the sub process.