dispatcher: fix crash at shutdown with incorrect table version
digest+m_auth: Allow a domain in the digest username.

Before this patch, a domain in the digest username was allowed:

    Digest username="abc@domain", realm="domain"

but only if the domain is equal to the realm. This was introduced in
a92bf789 (Juha Heinanen, Mar. 29 2006).

The SIP spec. doesn't mention any such restriction.

This patch undoes that commit and makes sure the whole username is used
when authenticating through `pv_www_authorize` and `pv_proxy_authorize`.
That makes the following valid:

    Digest username="abc@domain", realm="something different"
Merge pull request #164 from wdoekes/wjd-allow_domain_in_digest_user

digest+m_auth: Allow a domain in the digest username.
dispatcher: enhance MI ds_list command
 - print socket if set
 - print attr if set
Fixed bogus test over the presence of a request route. This was generating bogus warning messages to the logs, but without any negative impact over the actual processing.
Credits go to rrb3942 on GITHUB
Closes issue #162
cachedb_mongodb: fix BSON_DATE conversion
Fix NULL pointer deref. in "acc_db_request" when "db_url" is not set
cachedb_mongodb: use constants for oip size
cachedb_mongodb: retieve ObjectId _id as string