python: Make iterator handling Python 3 compatible

Many functions that used to return lists (e.g., dict.items()) now
return iterators and their iterator counterparts (e.g.,
dict.iteritems()) have been removed. Switch calls to the Python 2.7
iterator methods to use the Python 3 equivalent and add explicit list
conversions where necessary.

Change-Id: I0c18114955af8f4932d81fb689a0adb939dafaba
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/15992
Reviewed-by: Juha Jäykkä <juha.jaykka@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

src/python/m5/params.py

@@ -904,7 +904,7 @@ class Bool(ParamValue):
         code('%s to_bool(%s, %s);' % (ret, src, dest))
 
 def IncEthernetAddr(addr, val = 1):
-    bytes = map(lambda x: int(x, 16), addr.split(':'))
+    bytes = [ int(x, 16) for x in addr.split(':') ]
     bytes[5] += val
     for i in (5, 4, 3, 2, 1):
         val,rem = divmod(bytes[i], 256)
@@ -1282,7 +1282,7 @@ class MetaEnum(MetaParamValue):
                 raise TypeError("Enum-derived class attribute 'map' " \
                       "must be of type dict")
             # build list of value strings from map
-            cls.vals = cls.map.keys()
+            cls.vals = list(cls.map.keys())
             cls.vals.sort()
         elif 'vals' in init_dict:
             if not isinstance(cls.vals, list):
@@ -1453,7 +1453,7 @@ class Enum(ParamValue):
     @classmethod
     def cxx_ini_parse(cls, code, src, dest, ret):
         code('if (false) {')
-        for elem_name in cls.map.iterkeys():
+        for elem_name in cls.map.keys():
             code('} else if (%s == "%s") {' % (src, elem_name))
             code.indent()
             code('%s = Enums::%s;' % (dest, elem_name))