[sr-dev] [kamailio/kamailio] support subscribe dialog (topos + topos_redis) (#2662)

[fgaisnon]

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#### Description
topos_redis: support SUBSCRIBE dialog
topos: SUBSCRIBE dialog
topos: documentation for SUBSCRIBE dialog
topos: add description for dialog_expire key

Add support for dialog subscribe when using topos.
When a Subscribe is received, a Subscribe dialog is created. Dialog TTL is set according to expire received in SIP request.
At each resubscribe the TTL is refresh according to expires set in SIP request.
Notify (in-dialog) with header event set are supposed to be inside a Subscribe dialog.

bugfix:
topos: when contact mode is set to 1, contact uri created is malformed if received contact has no user part
In this case we have a sip uri like : sip:@host

htable: ht_dmq_replicate_action was always called on ht_rm_items even if dmq was not activated

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2662

-- Commit Summary --

  * topos: when contact mode is set to 1, contact uri created is malformed if received contact has no user part
  * topos_redis: support SUBSCRIBE dialog
  * htable: ht_dmq_replicate_action was always called on ht_rm_items even if dmq was not activated

-- File Changes --

    M src/modules/htable/htable.c (4)
    M src/modules/topos/doc/topos.xml (9)
    M src/modules/topos/doc/topos_admin.xml (7)
    M src/modules/topos/tps_msg.c (5)
    M src/modules/topos/tps_storage.c (41)
    M src/modules/topos/tps_storage.h (2)
    M src/modules/topos_redis/doc/topos_redis.xml (9)
    M src/modules/topos_redis/topos_redis_storage.c (75)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2662.patch
https://github.com/kamailio/kamailio/pull/2662.diff

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