Automate hadoop and spark installation

[jagadeesanas2]

What changes were proposed in this pull request?

Final PR for Automate Hadoop and spark installation Single node

• Check JAVA_HOME set in environment
• While running ./autogen.sh automatically config.sh will create with appropriate field values
• User can enter Spark and Hadoop version interactively while running ./autogen.sh file
• Validation for Slave IPs in network
• Automate hadoop download, config and installation
• Automate spark downlaod and installation
• Interactively we can run SparkPI example and check spark installation

[jagadeesanas2]

• Increased YARN_SCHEDULER_MAX_ALLOCATION_MB & YARN_SCHEDULER_MAX_ALLOCATION_VCORES default values
• Validation JAVA_HOME set in environment if not exit from script
• Validation for default hadoop port instances
• Clean and validated .bashrc file for both hadoop and spark env variables

[jagadeesanas2]

• Keep all default port values configurable in config.sh file
• Validation for default port instances
• Added checkall.sh this ensure all services are started on master & slaves
• Output of the script to a log file.

[jagadeesanas2]

Closing this PR #7
Automate Hadoop and Spark installation for single node and multi-node on single PR #8 .