common: New common option no-autostart.
* common/comopt.c (opts): Add "no-autostart". (parse_comopt): Set it. * common/comopt.h (comopt): Add no_autostart. * g10/gpg.c (main): Take care of the new option. * sm/gpgsm.c (main): Ditto. * tools/gpg-connect-agent.c (INCLUDED_BY_MAIN_MODULE): Add. (main): Parse common options and handle new option. * tools/gpg-card.c (main): Ditto. (cmd_yubikey): Fix minor error reporting issue. * common/util.h (GNUPG_MODULE_NAME_CARD): New const. * common/homedir.c (gnupg_module_name): Support it.
Having a global option makes it easier to use disable autostart on a
server which is required to use a remote gpg-agent reliable.