python: Replace dict.has_key with 'key in dict'

Python 3 has removed dict.has_key in favour of 'key in dict'.

Change-Id: I9852a5f57d672bea815308eb647a0ce45624fad5
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/15987
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>

src/SConscript

@@ -1338,7 +1338,7 @@ def identifyTarget(t):
     ext = t.split('.')[-1]
     if ext in target_types:
         return ext
-    if obj2target.has_key(ext):
+    if ext in obj2target:
         return obj2target[ext]
     match = re.search(r'/tests/([^/]+)/', t)
     if match and match.group(1) in target_types: