add 6873i template

Reviewed-by: Alexandre Fournier <None>

WAZO-2544: update Yealink T4XU, T3X(P)(G) and T5X(W)(C) firmwares

Reviewed-by: Pascal Cadotte Michaud <None>

[WAZO-2670] yealink-v85: upgrade W90 firmware

Reviewed-by: Pascal Cadotte Michaud <None>

WAZO-2666: fix Grandstream HT80X

Reviewed-by: Francois Blackburn <None>
Reviewed-by: Alexandre Fournier <None>
Reviewed-by: Pascal Cadotte Michaud <None>

[WAZO-2408] snom: add 10.1.101.11 plugin

Reviewed-by: Pascal Cadotte Michaud <None>

[WAZO-2669] yealink-v83: upgrade W80DM

Reviewed-by: Pascal Cadotte Michaud <None>

Why: 80DM upgrades its bases (W80B) automatically

[WAZO-2668] yealink-v85: upgrade W70B firmware

Reviewed-by: Pascal Cadotte Michaud <None>

Why: ` ` and ` ` are not the same :-)

yealink-v85: add memorykey and linekey's definition of U series

Reviewed-by: Alexandre Fournier <None>

add memorykey and linekey's definition of U series

Reviewed-by: Alexandre Fournier <None>

WAZO-2550: Aastra/Mitel DHCP update

Reviewed-by: Pascal Cadotte Michaud <None>

WAZO-2545: Patton upgrade

Reviewed-by: Pascal Cadotte Michaud <None>

[WAZO-2607] yealink-v85: add missing W73H handset

Reviewed-by: Pascal Cadotte Michaud <None>