Fix script bugs to support running on different nodes (MySQL server, and load generator node)

1. update the xml file, with 2 nodes' defination
2. update the xml file with hammerdb running parameters
3. update bash scripts to support running mysql server on another
server.
a) get mysql initial password from remote server;
b) run sql command on remote mysql server side to support connection
from outside hosts
c) update hammerdb config file to support run hammerdb against other
host other than 127.0.0.1