Improve superpmi.py scripting

[BruceForstall]

1. Update Azure storage collections location to a new location
   where we have appropriate permissions to manage the data.
2. Update the Azure storage upload/download implementation
   to the current version of the Azure Python API.
3. Add JIT-EE interface GUID to path of Azure stored
   collections. When downloading collections, use the appropriate
   collection for your JIT-EE interface GUID. This is all done
   by adding a "-printJITEEVersion" option to the SuperPMI
   MCS tool. Thus, to determine the JIT-EE version, we assume
   that MCS is built with the same version as the JIT (which
   will be true in a normal build), and that MCS is available
   and able to be run -- this typically requires a Core_Root
   location be available. The user can specify the JIT-EE
   version explicitly with the new -jit_ee_version argument.
4. Simplify the Azure storage format: there is no longer
   a JSON mapping of name to MCH file. Instead, there is just
   a directory full of files. By default, all files are downloaded
   and used for replay/asmdiffs, by that can be filtered with
   the new -filter argument.
5. The -mch_files (previously -mch_file) argument used
   by replay, asmdiffs, and upload, now accepts a list
   of directories and files, and for each directory all MCH
   files included in that directory, recursively, are used.
6. Also upload MCT (TOC) files with the MCH files.
7. A --force_download argument is added to allow forcing
   re-download of the Azure collections to the local cache.
8. PMI.dll is also looked for on the PATH before downloading
   a cached version from Azure storage.
9. Some of the lesser-used arguments were renamed to simplify them.
10. Various bugs were fixed and code simplification/reorganization was done.
    E.g., some of the commonality between replay and asmdiffs was
    factored out.
11. More code documentation was added.
12. The superpmi.md documentation was re-written and simplified.

[BruceForstall]

@kunalspathak Here's my current set of changes. I need to do a little more testing, update the superpmi.md documentation, and write a summary of the changes for the commit message.

[am11]

micro nit

Suggested change

	return_code = 1;
	return_code = 1

[BruceForstall]

That's what happens when you let a C programmer touch Python :)

[am11]

micro nit:

Suggested change

	if self.coreclr_args.log_file != None:
	if self.coreclr_args.log_file is not None:

[am11]

Suggested change

	# 3. A copy of coredistools. If, when doing asm diffs, a copy of the coredistools
	# 3. A copy of coredistools. If, when doing asm diffs, a copy of the coredistools

[BruceForstall]

This is ready for review.

@kunalspathak PTAL
cc @dotnet/jit-contrib

[BruceForstall]

Btw, none of this is used in the product, and there are a lot of changes, so you can choose how detailed a review you think is warranted.

[kunalspathak]

LGTM