oeqa/selftest/toaster.py: renamed to _toaster.py

In order not to run the toaster selftests by default, we renamed to _toaster.py

Signed-off-by: Ionut Chisanovici <ionutx.chisanovici@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
oeqa/selftest/_toaster.py: fix 'IndentationError' issues

There were some indentation errors when the _toaster.py was merged into master.
This patch fix those errors.

Signed-off-by: Ionut Chisanovici <ionutx.chisanovici@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>