[PATCH] improve xml config retrieval

[Nikos Mavrogiannopoulos]

The attached patches improve the XML configuration handling. The first
fixes the behavior of the client not being able to download the
configuration if the server doesn't provide any hash (doesn't address
the case where openconnect_set_xmlsha1 isn't called). The second
documents the fact that the configuration can be downloaded -without
connecting- using the --authenticate and -x flags. The last is an RFC
to replace the callback APIs with something more reasonable, i.e., a
flag to ask the client to download the config and a function for the
caller to retrieve it.

I am not sure whether the SHA1 hash for xml configs is of any use at
all. Most likely the configuration will be downloaded, not every time,
but at specific times where the user would like to retrieve that
configuration (e.g., first connection, or first connection after a
client reset).

If we agree on the API for xml config retrieval, I'll continue with a
patch to parse these configuration files.

regards,
Nikos
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