misc: updated shabang for python script

The default python on MacOS doesn’t have an alias to python2.
The official python version supported in gem5 is Python2.7.

This patch updates the shabang according to the version required in gem5.

Change-Id: I9533c0f7858b5b3cab0ef101be1ee5cd718105b0
Reviewed-on: https://gem5-review.googlesource.com/c/15375
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>

misc: Update #!env calls for python to explicit version

In some newer Linux distributions, env python default to Python 3.0. This
patch explicitly uses "python2" instead of just "python" for all scripts
that use #!

Reported-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

arm: Fix for ARM's Streamline conversion script

tracked down issue with ARM's version of gem5 using the "cluster" name.
The public/github version of ARM Gem5 does not use the "cluster" naming
mechanism.

Signed-off-by: Dam Sunwoo <dam.sunwoo@arm.com>
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

config: Update Streamline scripts and configs

Updated the stat_config.ini files to reflect new structure.

Moved to a more generic stat naming scheme that can easily handle
multiple CPUs and L2s by letting the script replace pre-defined #
symbols to CPU or L2 ids.

Removed the previous per_switch_cpus sections. Still can be used by
spelling out the stat names if necessary. (Resuming from checkpoints
no longer use switch_cpus. Only fast-forwarding does.)

util: updated Streamline flow to support ARM DS-5 v5.17 protocol

The previous flow supported ARM DS-5 v5.13 protocol.

util: Streamline .apc project convertsion script

This Python script generates an ARM DS-5 Streamline .apc project based
on gem5 run. To successfully convert, the gem5 runs needs to be run
with the context-switch-based stats dump option enabled (The guest
kernel also needs to be patched to allow gem5 interrogate its task
information.) See help for more information.