MB-16913 reset 'lastbid' if read fails in docio_read_through_buffer
MB-16913 reset 'lastbid' if read fails in docio_read_through_buffer

- Although read fails due to various reasons, the contents of
'dhandle->readbuffer' may change and contain garbage data as a result
of read failure.

- The most simple solution is to reset 'lastbid' to read the block
once again at the next _docio_read_through_buffer call.

Change-Id: Ib1f38a89240ecfedd10c8771e5c6f0d3424f3e23

hisundar/forestdb,wurikiji/forestdb,couchbase/forestdb,wurikiji/forestdb,couchbase/forestdb,hisundar/forestdb