manually encode newlines on all printed commands

This way we group key value arguments: e.g.:

    make \
    -j 8 \
    all

instead of:

    make \
    -j \
    8 \
    all

and reach CLI nirvana, while also subtly breaking several commands due to
lack of testing.

build-m5

@@ -14,12 +14,12 @@ class M5Component(common.Component):
         else:
             arch = args.arch
         return [
-            'make',
-            '-j', str(args.nproc),
-            '-f', 'Makefile.{}'.format(arch),
-            'CC={}'.format(cc),
-            'LD={}'.format(ld),
-            'PWD={}'.format(common.gem5_m5_src_dir),
+            'make', common.Newline,
+            '-j', str(args.nproc), common.Newline,
+            '-f', 'Makefile.{}'.format(arch), common.Newline,
+            'CC={}'.format(cc), common.Newline,
+            'LD={}'.format(ld), common.Newline,
+            'PWD={}'.format(common.gem5_m5_src_dir), common.Newline,
         ]
 
     def do_build(self, args):
@@ -36,7 +36,7 @@ class M5Component(common.Component):
 
     def clean(self, args):
         common.run_cmd(
-            self.get_make_cmd(args) + ['clean'],
+            self.get_make_cmd(args) + ['clean', common.Newline],
             cwd=common.gem5_m5_src_dir,
         )