Multiple LDT updates:  cleanup, fixes, features.
Merge branch 'master' of github.com:citrusleaf/aerospike-lua-core
Fix Sub-Record Open/Close/Update problem.
Fixes to LDT to address sub-rec issues.
Added functions to help with bulk LDT loading.
Updates to LDT for expanded SubRec management and  Configuration
along with some fixes for recent typos.
Update to temporarily fix the subrec update problem.
Code and Doc Fixes, and config extentions to LDT.
Updates and fixes to LDT.
Fixes for LDT SubRec remove and turned off debug.
[LDT] SubRec and List fixes from LDT Testing.
[LDT] Fixes for bugs exposed from new LDT Tests (AER-2451]
[LDT] Minor fixes to LSET, LMAP