style(maas): s/get_ecan_objectIds/get_ecan_object_ids

We should be consistent about using underscores and no CamelCase when
defining function names, since Python is strictly a
`words_with_underscores` language when it comes to defining functions
(PEP 8).
Merge pull request #127 from ksheedlo/style-fix-mixed-underscores-camel

RFR: style(maas): s/get_ecan_objectIds/get_ecan_object_ids