GeezerVison

Fixes #836

find_children_w_parents grouped lines by their top level parent instead of the actual matched line. So matching one child pulled in every sibling under the same parent, even ones that don't match the pattern at all.

Example from the issue:

parsed.find_children_w_parents(parent_pattern="context local", child_pattern=" logging", match_type="regex")

Before it also returned "something not logging". Now only the two logging lines come back.

Also updated the existing ios_full_received.txt fixture. It expected contact-email-addr to be included alongside profile "CiscoTAC-1", but contact-email-addr doesn't match the test's child_pattern at all, it's just a sibling under call-home. Same bug, just baked into the expected test output. Added a separate flat_siblings test case for the exact issue scenario.