initial check-in to handle index-type configs
TODO: cover flash, pmem, shmem

handled array type of stats like
flash
pmem
device/ file

initial commit of refresh-configs along with stats

refactored xdr to fetch dc-config, dc-namespace config and dc-namespace-stats also
moved config command into passTwoKeys in node-stats
moved "build" command from latency-watcher to observer as it is common for all watchers, this will remove ordering watchers while parsing
refactored passone and passtwo variable to suite the usecase

incorporated review feedback on return error and unnecessary error handling
removed fmt.printlns and corrected log-level to warn

cluster-name and service are null while sending index-type and storage-engine stats

added sindex handling along with storage and index
enhanced the test-case structure

corrected node-stats reading config command
refactored node-stats config and stats in same utility
added comments and removed unnecessary code

added raw-metrics dump code - this is required to validate exporter values during each refresh iteration

adding persistance-type in labels
refactoring test-cases

test-case cleanup and re-organised

removed comments and fmt.printlns

removed metric dump to local files.

tried to optimize and remove unnecessary code

optimized code and removed unnecessary code

moved constants back to common.go, this will avoid cyclical dependency between watcher-namespace and common.go

added common method to push to prometheus
removed commented code

removed additional _ (underscore) which is appended to the metric

Om92 - merge for testing