Defer sigalgs selection until the certificate is known.

Previously the signature algorithm was selected when the TLS extension was
parsed (or the client received a certificate request), however the actual
certificate to be used is not known at this stage. This leads to various
problems, including the selection of a signature algorithm that cannot be
used with the certificate key size (as found by jeremy@ via ruby regress).

Instead, store the signature algorithms list and only select a signature
algorithm when we're ready to do signature generation.

Joint work with beck@.

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