[sr-dev] [kamailio/kamailio] db_text: implement fetch and memory constraints (#941)

[lazedo]

when dealing with large db_text files, pkg_memory is not suitable for
operating the database.

implementing fetch allows modules like presence & registrar & usrloc
to query large tables without constraints on pkg_memory.

creates tmp tables in shared memory for query results

(cherry picked from commit 18c64d2c9ff1527655055f75aa22e7d68c307874)

Conflicts:
	src/modules/db_text/db_text.c
	src/modules/db_text/dbt_api.c
	src/modules/db_text/dbt_base.c
	src/modules/db_text/dbt_lib.c
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/941

-- Commit Summary --

  * db_text: implement fetch and memory constraints

-- File Changes --

    M src/modules/db_text/db_text.c (9)
    M src/modules/db_text/db_text.h (4)
    M src/modules/db_text/dbt_api.c (107)
    M src/modules/db_text/dbt_api.h (6)
    M src/modules/db_text/dbt_base.c (185)
    M src/modules/db_text/dbt_lib.c (62)
    M src/modules/db_text/dbt_lib.h (6)
    M src/modules/db_text/dbt_res.c (202)
    M src/modules/db_text/dbt_res.h (14)
    M src/modules/db_text/dbt_tb.c (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/941.patch
https://github.com/kamailio/kamailio/pull/941.diff

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