updates for CDH 4.3 for hdfs space, replication and balance
updated lib
intermediate commit having fixed node count and node list options
added comment not to use jobtracker heap
updated NameNode Heap parsing
some clean up and output the space figures as well as % for --hdfs-space
updated check_hadoop_namenode.pl
added flags to tighten validation of thresholds depending on the different uses
added missing semicolon for style
added a couple todos to check_hadoop_dfs.pl
moved use lwp before use lib
moved check_hadoop_namenode.pl out of TODO