Core/Creature: Snake Trap

Description: When Snake Trap is activated by a player or creature that is not in combat with the hunt, snakes will get the unit that triggered the trap as target without attacking it.

Current behavior: Snakes from Snake Trap doesn't attack the target if it's not in combat with the hunt

Expected behavior: Snakes from Snake Trap must always attack the unit that trigger the trap

Steps to reproduce the problem:

1. connect a hunt and a second char from the opposite faction
2. Summon a snake trap .cast 34600
3. trigger the trap by the second char, notice snakes follow you but doesn't attack, If you attack the hunt when this snakes are following you they will attack you back.

Branch(es): 3.3.5

TrinityCore rev. 743980a6255a 2018-04-15 17:08:48 +0200 (3.3.5 branch) (Win32, Release, Static)
Using SSL version: OpenSSL 1.0.1e 11 Feb 2013 (library: OpenSSL 1.0.1e 11 Feb 2013)
Using Boost version: 1.59.0
Using MySQL version: 5.5.39
Using CMake version: 3.10.1
Compiled on: Windows 10.0.16299
Automatic database updates are disabled for all databases!
Worldserver listening connections on port 8085
Realmlist (Realm Id: 1) configured in port 8085
VMAPs status: Enabled. LineOfSight: 1, getHeight: 1, indoorCheck: 1
MMAPs status: Enabled
maps directory located in ./maps. Total size: 252191207 bytes
vmaps directory located in ./vmaps. Total size: 588247501 bytes
mmaps directory located in ./mmaps. Total size: 2229000480 bytes
Using frFR DBC Locale as default. All available DBC locales: frFR
Using World DB: TDB 335.64
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