tools: move python code out of jenkins shell

https://ci.nodejs.org/job/node-test-commit-v8-linux/configure echoes
python code into tools and runs it. Move these scripts into tools for
better maintainability.

Once this lands and is back-ported into LTS branches a bunch of shell
code can be deleted from the job.

Author: sam-github

tools/getarch.py

@@ -0,0 +1,10 @@
+from __future__ import print_function
+from utils import GuessArchitecture
+arch = GuessArchitecture()
+
+# assume 64 bit unless set specifically
+print(GuessArchitecture() \
+    .replace('ia32', 'x64') \
+    .replace('ppc', 'ppc64') \
+    .replace('arm', 'arm64') \
+    .replace('s390', 's390x'))

tools/getendian.py

@@ -0,0 +1,4 @@
+from __future__ import print_function
+import sys
+# "little" or "big"
+print(sys.byteorder)

tools/getmachine.py

@@ -0,0 +1,3 @@
+from __future__ import print_function
+import platform
+print(platform.machine())

tools/getnodeversion.py

@@ -1,3 +1,4 @@
+from __future__ import print_function
 import os
 import re