init configs get appended to drill-config.sh

the intention is to get logdir and other init properties be propagated to all the commandline tools. we still need to manually change sqlline script unless the change is added to the repository itself. here is the diff:
```
[hadoop@ip-10-34-170-119 ~]$ diff drill/bin/sqlline drill/bin/sqlline.old
52c52
< CP=$CP:$HADOOP_CLASSPATH
---
> CP=$HADOOP_CLASSPATH:$CP
```