#### Pre-Submission Checklist
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checkboxes that apply -->
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guidelines from above-->
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- [X] Commit message has the format required by CONTRIBUTING guide
- [X] Commits are split per component (core, individual modules, libs, utils, 
...)
- [X] Each component has a single commit (if not, squash them into one commit)
- [X] No commits to README files for modules (changes must be done to docbook 
files
in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [X] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
<!-- Go over all points below, and after creating the PR, tick the 
checkboxes that apply -->
- [ ] PR should be backported to stable branches
- [X] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description

Move permissions module to work with hash tables instead of directly working 
with lists.

Use locks to cover these hash tables.
This allows to avoid using crutches alike 0039c50e83916,
and gives a race-free usage of tables regardless the amount of data inserted 
into tables and regardless how many competitive reloads are pending at a time 
(e.g. 2-3 RPC commands sent at a time to reload same tables).

Use hash indexes for a quicker lookup in buckets.

Improve the mechanism of duplicate entries detection,
use: the source ip, ruri pattern, from pattern and the protocol to detect 
existing similar entries.

Add more safety checks in functions manipulating hash tables,
like checking NULL pointers, empty patterns for matching purposes etc.

Align return values in trusted/hash implementations so that return values are 
everywhere considered in the similar way
(everything != 0 is considered as failure, 0 is considered as fine).

Split tables allocation and initialization.

Add destruction handlers for tables instead of manually handling
entries freeing.

Some other minor improvements.

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

  https://github.com/kamailio/kamailio/pull/4539

-- Commit Summary --

  * permissions: remove the permissions reload rework
  * permissions: hash header, remove dangling declarations
  * permissions: support locked tables
  * permissions: module rework to support locks
  * permissions: remove unsed hash functions

-- File Changes --

    M src/modules/permissions/hash.c (566)
    M src/modules/permissions/hash.h (64)
    M src/modules/permissions/rpc.c (18)
    M src/modules/permissions/trusted.c (143)
    M src/modules/permissions/trusted.h (11)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/4539.patch
https://github.com/kamailio/kamailio/pull/4539.diff

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