Split pkinit_identity_initialize into two phases

Split part of pkinit_identity_initialize() into a second piece named
pkinit_identity_prompt().  Have each piece pass a new boolean flag to
crypto_load_certs() to indicate if it should defer prompting for a
password/PIN for client identities that require one.  If the flag isn't
set, then crypto_load_certs() should attempt to use a responder-supplied
value, or call the prompter if there isn't one.
Add support for PKINIT deferring identity prompts

Learn to manage a list of deferred identities, for which we want to
prompt for passwords or PINs, in pkinit_identity_crypto_context
structures, along with their associated token flags.  These are opaque
outside of pkinit_crypto_openssl and pkinit_crypto_nss, so both
implementations need to provide wrapper functions that can be called
from elsewhere in the module to populate and query the lists.
Use PKCS11_MODNAME for NSS PKINIT by default

Do what the OpenSSL-using code paths do, and load PKCS11_MODNAME if no
module is specified when we're told to use a PKCS11 identity.
Support PKINIT NSS deferred identity prompting

The password callback which we usually supply to NSS already gets a
pointer to the pkinit_identity_crypto_context structure, but it needs to
be passed the name of the identity for which it's being called.

If it gets a name, and it's deferring prompting, just add the identity
to the list of deferred identity prompts (the password callback wouldn't
have been called if its result wasn't needed), and either return NULL
(as an indication that we couldn't get a password) or an empty string
(a value which we know is invalid) if that's handier.

Otherwise, check for a password that's been stashed for its use for that
identity, and return a copy of it if one's found.  If none of that
works, try to use the prompter callback to ask for the password.
Pass PKINIT identity prompts to the responder cb

Use the list of deferred identity prompts and warnings, which we have
after calling pkinit_identity_initialize(), to build a list of questions
to supply to responder callbacks.

Before calling pkinit_identity_prompt() to actually load identities that
are protected, save any passwords and PINs which a responder callback
may have supplied.

Because pkinit_client_prep_questions() can be called multiple times, and
we don't want to try to load all of our identities each of those times,
take some steps to ensure that we only call pkinit_identity_initialize()
and pkinit_identity_prompt() once per request.
Support PKINIT OpenSSL deferred identity prompting

Add a password to the set of things that we can pass to a PEM password
callback and the function we use for loading PKCS12 bundles.  If we're
meant to defer identity prompts, just store the name of the identity
which we're loading.  Otherwise, if we're passed a password, use it.
Otherwise, use the prompter callback.

Add a password to the set of things that we can pass to the function
that we use for logging in to PKCS11 tokens, too, but if we're deferring
identity prompts, just return the identity name without doing anything
else.  If not, and we're passed a password, use that.  Otherwise, try to
use the prompter callback to get one.
Add non-JSON APIs for PKINIT responder items

Add wrappers for the JSON-oriented APIs for PKINIT responder items,
modeled after the API we provide for OTP items:

* krb5_responder_pkinit_get_challenge() returns the list of
  identities for which we need PINs
* krb5_responder_pkinit_challenge_free() frees the structure that
  was returned by krb5_responder_pkinit_get_challenge()
* krb5_responder_pkinit_set_answer() sets the answer to the PIN for
  one of the identities
Add a helper for testing PKINIT and responder cb

This test helper takes multiple options and one argument.

./misc/test_responder [options] principal
 -X preauth_option -> preauth options, as for kinit
 -x challenge      -> expected responder challenge, of the form
                      "question=challenge"
 -r response       -> provide a reponder answer, in the form
                      "question=answer"
 -c                -> print the pkinit challenge
 -p identity=pin   -> provide a pkinit answer, in the form "identity=pin"
 principal         -> client principal name

If the responder callback isn't called, that's treated as an error.

If an expected responder challenge is specified, when the responder
callback is called, the challenge associated with the specified question
is compared against the specified value.  If the value provided to the
callback doesn't parse as JSON, a literal string compare is performed,
otherwise both values are parsed as JSON and then re-encoded before
comparison.  In either case, the comparison must succeed.

Any missing data or mismatches are treated as errors.
Add tests for PKINIT using responder functionality

We now also test that the PKINIT challenge looks like we expect it to
look, that PKINIT fails if we don't provide a response or a prompter
callback, and that PKINIT succeeds with a response provided using either
the raw responder API or the PKINIT responder functions.

One thing that we don't check is which specific error code we get when
PKINIT fails:  the OpenSSL and NSS versions return different error codes
(some mixture of EIO, ENOMEM, ENOENT, and KRB5KDC_ERR_PREAUTH_FAILED)
when they encounter trouble loading client credentials.
Add error codes to more PKINIT debug messages

Add the library-supplied error code to more of the debug messages that
we emit when things fail, and make sure we always call
PK11_TokenRefresh() on a token before attempting to check if we're
logged in to it or not.