SERVER-14732 Fixed an issue where a cursor locate was being called with an empty argument

Closes #728

Signed-off-by: Benety Goh <benety@mongodb.com>
SERVER-13635: add storageEngine section in serverStatus
SERVER-13635: make profile tests work for generic storage engines
SERVER-13635: make drop test work for generic storage engine
SERVER-13635 SERVER-1153: fix collmod test to be genric and support in heap1
SERVER-13635: move compact tests into mmap_v1
SERVER-14747 fix memory leak in MultiPlanStage
SERVER-14634 move MultiIteratorStage and PipelineProxyStage into exec/ directory
Merge remote-tracking branch 'upstream/master'