python: Enforce absolute imports for Python 3 compatibility

Change-Id: Ia88d7fd472f7aed9b97df81468211384981bf6c6
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/15983
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/python/m5/simulate.py

@@ -51,14 +51,14 @@ import _m5.drain
 import _m5.core
 from _m5.stats import updateEvents as updateStatEvents
 
-import stats
-import SimObject
-import ticks
-import objects
+from . import stats
+from . import SimObject
+from . import ticks
+from . import objects
 from m5.util.dot_writer import do_dot, do_dvfs_dot
 
-from util import fatal
-from util import attrdict
+from .util import fatal
+from .util import attrdict
 
 # define a MaxTick parameter, unsigned 64 bit
 MaxTick = 2**64 - 1