transfer: conn close on paused upload

- add 2 variations on test_07_42 which PAUSEs uploads
and response connections terminating either right away
or after the 100-continue respo

transfer: conn close on paused upload

- add 2 variations on test_07_42 which PAUSEs uploads
and response connections terminating either right away
or after the 100-continue response
- when detecting the connection being closed in transfer.c
readwrite_data(), clear ALL send bits in data->req.keepon.
It no longer makes send to wait for a KEEP_SEND_PAUSE or HOLD.
- in the protocol client writer add the check for incomplete
response bodies. When an EOS is seen and the length is known,
check that and fail if bytes are missing.

Reported-by: Sergey Bronnikov
Fixes #13740
Closes #13750

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request: paused upload on completed download, assess connection

A transfer with a completed download that is still uploading needs to
check the connection state when it is PAUSEd, since

request: paused upload on completed download, assess connection

A transfer with a completed download that is still uploading needs to
check the connection state when it is PAUSEd, since connection
close/errors would otherwise go unnoticed.

Reported-by: Sergey Bronnikov
Fixes #13260
Closes #13271

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