[sr-dev] [kamailio/kamailio] usrloc: cancel unnecessary db queries (#2726)

[korayvt]

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#### Description
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It looks like the db query is made before checking the configuration parameters for the following features:
- internal keep-alive mechanism
- contact-expired callback execution

For example, although keepalive mode is turned off, the location table is periodically queried.
This is also true when there is no usrloc:contact-expired route.

In this commit, checks are added before these two db queries.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2726

-- Commit Summary --

  * Merge pull request #1 from kamailio/master
  * Merge pull request #2 from kamailio/master
  * Merge pull request #3 from kamailio/master
  * usrloc: unnecessary periodic db queries cancelled

-- File Changes --

    M src/modules/usrloc/dlist.c (4)
    M src/modules/usrloc/udomain.c (6)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2726.patch
https://github.com/kamailio/kamailio/pull/2726.diff

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