oeqa/selftest/toaster: fix bad indent

oeqa/selftest/toaster: fix bad indent

oe-selftest --list-classes crashes because
of a bad indent (see below). Fixed.

systemd-build$ oe-selftest --list-classes
2015-04-22 12:12:39,141 - selftest - INFO - Listing all available test modules:
_sstatetests_noauto (hidden)
 -- SStateBase
 -- RebuildFromSState
 --  -- test_sstate_rebuild
 --  -- test_sstate_relocation
_toaster (hidden)
Traceback (most recent call last):
  File "/mnt/Yo/yoctoproject/poky/scripts/oe-selftest", line 201, in <module>
    ret = main()
  File "/mnt/Yo/yoctoproject/poky/scripts/oe-selftest", line 157, in main
    modlib = importlib.import_module(test)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/mnt/Yo/yoctoproject/poky/meta/lib/oeqa/selftest/_toaster.py", line 438
    time.sleep(3)
    ^
IndentationError: unexpected indent

Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>