Fix wrong method name assert_called_once

There isn't method assert_called_once, and it doesn't really
check anything. We'd better check mock.called directly.

Change-Id: Iffbaa176c3efd41084a655adcbbb0821d8ad496d
Expose load_commands publicly

This will allow us to load commands from other entrypoints into the
list. It brings together the two CommandManager overrides in tests into
one place in utils to simply usage.

Change-Id: Ib463eff98c2ac04488ce4a8875cf3e1b7779b27c
fixed typos found by RETF rules

rules are avaialble at https://en.wikipedia.org/wiki/Wikipedia:AutoWikiBrowser/Typos

Change-Id: I1ecf1b48d82c71ef12cf419540740aac2d64bb56
CSV formatter should use system-dependent line ending

Closes bug 1298907

Change-Id: I6042efc694fefc705db5d425142a1068780ef2de
Merge "Fix wrong method name assert_called_once"
Merge "fixed typos found by RETF rules"
Merge "Expose load_commands publicly"
Merge "CSV formatter should use system-dependent line ending"