PR for Automate Hadoop and spark installation on both single and multi node

[jagadeesanas2]

What changes were proposed in this pull request?

• Check JAVA_HOME set in environment
• While running ./autogen_multinode.sh automatically config.sh will create with appropriate field values
• Keep all default port values configurable in config.sh file
• Validation for default port instances
• User can enter SLAVEIPs (if more than one, use comma separated). Spark and Hadoop version also can enter interactively while running ./autogen_multinode.sh file.
• Clean and validated .bashrc file for both hadoop and spark env variables
• Validation for Slave IPs in network
• Automate hadoop download, config and installation for all nodes
• Automate spark download and installation for all nodes
• Added checkall.sh this ensure all services are started on master & slaves
• Output of the script to a log file under logs directory with time-stamp.