Improve logging when source hash mismatches.

When applying an operation, the source hash may mismatch the one the
payload expects. The current log only shows the operation number across
all operations in the payload. This patch also includes the operation
number in the current partition and the partition name.

Bug: 28626303
TEST=deployed the wrong delta payload and saw the partition name and number.

Change-Id: I8d6d1639deffbc360fa7a02448d1ad28fa80aafe