Enable check for E121

E121 continuation line under-indented for hanging indent

Change-Id: I4cf246e3ec932ba0d2391eb8bcb793b28b005b4c
Enable check for E122

E122 continuation line missing indentation or outdented

Change-Id: Ic54714142b3c5aded42d544f296b0ef9a840c282
Enable check for E123

E123 closing bracket does not match indentation of opening bracket's line

Change-Id: I3f941032efb5ca2ef9a78f865effbf79c8674ebb