gpg: Improve and regularize naming of signature checking functions.
* g10/packet.h (signature_check): Rename from this... (check_signature): ... to this. Update users. (signature_check2): Rename from this... (check_signature2): ... to this. Update users. * g10/sig-check.c (do_check): Rename from this... (check_signature_end): ... to this. Update users. (do_check_messages): Rename from this... (check_signature_metadata_validity): ... to this. Update users.
- Signed-off-by: Neal H. Walfield <neal@g10code.com>