"=" not escaped when the CEF message constructed

[ArmsSec]

the __sanitize function in cef.py is missing the escape of the "=" character.
The CEF message will not get parsed correctly if there are values that will include "=" since it will treat that as a new set of key-value pair.
this should be included in the code:
value = value.replace('=', '=')
As an example if the logs include the URI requested by the user, that usually have "=" sign, the message will not get parsed correctly.