Merge pull request #2840 from raydavis/qawip

CLC-4132 QA Fix null teacher roles in zero-padded CCNs
CLC-4136 - Updated spec to use more reliable test user
Merge pull request #2841 from redconfetti/QA-CLC-4136-canvas-ldap-test-failure

[QA] CLC-4136 - Updated spec to use more reliable test user
CLC-4141 Selectively disable bCourses user name synchronization