vs: remove 28 functions (deprecated since privsep)

* dump
* lastUsedOplogInOplog
* trackOplog
* stopTrack
* allVersionedCollectionsEmpty
* minTimestamp
* start
* trackOplogAndVCs
* setupVcToVcConfigs
* trackVersionedCollections
* _trackOplog
* _versionedCollectionCounts
* _getOldestOplogItem
* _getLatestOplogItem
* _startAutoProcessing
* _stopAutoProcessing
* _removeLastUsedCollectionOplogItem
* _removeLastUsedOplogItem
* _getByKey
* _getLastUsedCollectionOplogItem
* _getLastUsedOplogItem
* _saveLastUsedCollectionOplogItem
* _saveLastUsedOplogItem
* _resolveSnapshotToOplog
* _resolveSnapshotOffsets
* _determineOplogOffsets
* _tailOplog
vs tests: remove deprecated tests
vs tests: disable functions

rebuild
info
_ensureSnapshotCollections
vs initial tests for initVCs
vc: save namespace in vc.ns
vcexec: converge parameters to one object
vs: further simplify constructor
vs: test initVCs _ensureSnapshotAndOplogOffset and info
vs test: add tests for chroot
preauth: use predictable UNIX domain socket
vs: test createServer + minor fixes
preauth: strict type checking of config params
preauth: fail early if not executed as root
replace split with ld-jsonstream

ld-jsonstream fails early if maxBytes is exceeded, split does not
fail early when maxLength is exceeded and has extra deps.
preauth: add tests
preauth: add test with auth request
preauth test: set encoding utf8 on stderr, stdout
preauth: create world writable socket
preauth: don't debug password
push_request: work with undefined values