* first round cleanup based on go-critic
* more issues resolved for ifelsechain and unlambda checks
* updated from master and gocritic found a new ifElseChain issue
* disable appendAssign. i reports false positives
* re-enabled go-critic appendAssign and disabled lint check at code line level
* fixed go-critic lint error
* fixed // nolint add gocritic specifically
* Space and bandwidth allocation check
* use proper config flag
* one more check + tests
* use monitor to check space and bandwidth
* remove unused field
* check during read/write
* fix linter
* fix pieceid
* remove unused methods
* revert unneeded change
