modules: Do not hide errors using IPA *_show command with Exception

When searching for objects with *_show IPA API command, most plugins
were hiding errors other than "ipalib_errors.NotFound" by handling the
broad exception Exception instead.

This patch uses "ipalib_errors.NotFound" whenever "*_show" is used so
that the only exception handled is when an object is not found. Other
errors will not be handled making the module break as expected.

plugins/modules/ipaconfig.py

@@ -356,7 +356,7 @@ def config_show(module):
 def get_netbios_name(module):
     try:
         _result = module.ipa_command_no_name("trustconfig_show", {"all": True})
-    except Exception:  # pylint: disable=broad-except
+    except ipalib_errors.NotFound:
         return None
     return _result["result"]["ipantflatname"][0]