WT-1145 Load live lock diagnostic

• Closed

WT-1102 Test failure with available list assert

• Closed

WT-1141 Cache metadata reference when creating internal sessions.

• Closed

WT-1144 Make checkpoint cache handles, not a list of URIs, when flushing leaf pages.

• Closed

WT-1146 Grab the live lock when loading a checkpoint in diagnostic mode

• Closed