gpg --gen-key --batch RSA keys default to 1024 bits

[Daniel Kahn Gillmor]

gpg --gen-key currently defaults interactively to creating 2048-bit RSA
keys.

But using gpg --gen-key --batch with Key-Type: RSA defaults to 1024 bits:
> 
> 0 dkg at alice:/tmp/cdtemp.MTYWwo$ printf "Key-Type: RSA\nName-Real: foobar\n" | gpg --batch --gen-key --yes
> gpg: keyring `/tmp/cdtemp.MTYWwo/secring.gpg' created
> gpg: keyring `/tmp/cdtemp.MTYWwo/pubring.gpg' created
> gpg: keysize invalid; using 1024 bits
> 
> Not enough random bytes available.  Please do some other work to give
> the OS a chance to collect more entropy! (Need 257 more bytes)
> +++++
> +++++
> gpg: /tmp/cdtemp.MTYWwo/trustdb.gpg: trustdb created
> gpg: key 2576700C marked as ultimately trusted
> 0 dkg at alice:/tmp/cdtemp.MTYWwo$ 

It seems like these defaults should be aligned with each other.

	--dkg

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