devtool: Setup logging before calling prepare

This avoids test failures like:

INFO - ======================================================================
INFO - FAIL [1.755s]: test_devtool_layer_plugins (devtool.DevtoolTests)
INFO - ----------------------------------------------------------------------
INFO - Traceback (most recent call last):
  File "/media/build1/poky/meta/lib/oeqa/core/decorator/__init__.py", line 32, in wrapped_f
    return func(*args, **kwargs)
  File "/media/build1/poky/meta/lib/oeqa/selftest/cases/devtool.py", line 1354, in test_devtool_layer_plugins
    self.assertEqual(result.output, s[::-1])
AssertionError: "NOTE: Starting bitbake server...\noY senu[36 chars]rciM" != "oY senuZ s'enoynA morF tiforP oN edaM tfosorciM"
- NOTE: Starting bitbake server...
  oY senuZ s'enoynA morF tiforP oN edaM tfosorciM
INFO - ----------------------------------------------------------------------

since there is corruption in the output. Setting the logging up before
calling tinfoil.prepare() resolves this.

(From OE-Core rev: 3c479fb17ae4d3e7e5f0889af0f68257ef66475c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/devtool/__init__.py

@@ -115,8 +115,8 @@ def setup_tinfoil(config_only=False, basepath=None, tracking=False):
         import bb.tinfoil
         tinfoil = bb.tinfoil.Tinfoil(tracking=tracking)
         try:
-            tinfoil.prepare(config_only)
             tinfoil.logger.setLevel(logger.getEffectiveLevel())
+            tinfoil.prepare(config_only)
         except bb.tinfoil.TinfoilUIException:
             tinfoil.shutdown()
             raise DevtoolError('Failed to start bitbake environment')