repo: rename the output format "keyvalue" to "lines"

Both subcommands in git-repo(1) accept the "keyvalue" format. This
format is newline-delimited, where the key is separated from the
value with an equals sign.

The name of this option is suboptimal though, as it is both too
limiting while at the same time not really indicating what it
actually does:

  - There is no mention of the format being newline-delimited, which
    is the key differentiator to the "nul" format.

  - Both "nul" and "keyvalue" have a key and a value, so the latter
    is not exactly giving any hint what makes it so special.

  - "keyvalue" requires there to be, well, a key and a value, but we
    want to add additional output that is only going to be newline
    delimited.

Taken together, "keyvalue" is kind of a bad name for this output
format.

Luckily, the git-repo(1) command is still rather new and marked as
experimental, so things aren't cast into stone yet. Rename the
format to "lines" instead to better indicate that the major
difference is that we'll get newline-delimited output. This new name
will also be a better fit for a subsequent extension in git-repo(1).

Helped-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Lucas Seiki Oshiro <lucasseikioshiro@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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