This CR changes the statedb impl for the couchdb such that it does
not propagate the errors that are caused by erroneous db artifacts present
in the chaincode package archive. This is because a bad index file could bring
the peer to a halt until the chaincode package in uninstalled

Change-Id: Iecb8c243fcb5c8e01beb31a6ca21a53a1b14a354
Signed-off-by: manish <manish.sethi@gmail.com>