Werk #7335: Fixed broken regex based hostname translation in EC

The hostname translation of the EC was broken since release of Check_MK 1.4.0 (caused by #3687). This issue lead to dropped events once the translation has been condifgured. The problem was visible in the mkeventd.log in the following form:

 2019-04-04 11:36:24,286 [40] [cmk.mkeventd.EventServer] Unable to parse host "HOST" ('tuple' object has no attribute 'endswith')
Traceback (most recent call last):
  File "/omd/sites/snmp/lib/python/cmk/ec/main.py", line 2787, in do_translate_hostname
    event["host"] = self.translate_hostname(event["host"])
  File "/omd/sites/snmp/lib/python/cmk/ec/main.py", line 2768, in translate_hostname
    if not regex.endswith('$'):
AttributeError: 'tuple' object has no attribute 'endswith' 

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