mtest: allow parsing TAP line by line

This is the first step towards asynchronous parsing of the TAP output.
We will need to call the same code from both a "for" loop (for unit
tests) and an "async for" loop (for mtest itself).  Because the same
function cannot be both a generator and an asynchronous generator, we
need to build both on a common core.  This commit therefore introduces
a parse_line function that "parse" can call in a loop.  All the local
variables of TAPParser.parse move into "self".

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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