ipatests: make assert_error function compatible with python version < 3.7 #4146
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In 3d779b4 assert_error was changed to handle both strings and compiled
regexp objects in argument
pattern
. For this it used expressionisinstance(pattern, re.Pattern)
. re.Pattern object was introduced inpython 3.7, so the tests which call this function can not be executed
with older versions of python though and for now we claim support for
python 3.6+.
Fixed by replacing the condition with duck-typing check.
Fixes: https://pagure.io/freeipa/issue/8179