HC-393: add target tracking metric for autoscaling that allows for 1:1 scaling of jobs to workers

[pymonger]

Details of this PR is shared with hysds/hysds#128.

Specific to this repository, this PR:

• add support to the sds CLI to allow end user to specify target tracking metric to use during sds cloud asg create
• detects target tracking metric per queue in .sds/config and specifies the corresponding CloudWatch metric name
• addresses an issue when running sds update mozart where the following error is encountered:

[100.104.10.132] out: ERROR: Exception:
[100.104.10.132] out: Traceback (most recent call last):
[100.104.10.132] out:   File "/export/home/hysdsops/verdi/lib/python3.9/site-packages/pip/_internal/cli/base_command.py", line 164, in exc_logging_wrapper
[100.104.10.132] out:     status = run_func(*args)
[100.104.10.132] out:   File "/export/home/hysdsops/verdi/lib/python3.9/site-packages/pip/_internal/cli/req_command.py", line 205, in wrapper
[100.104.10.132] out:     return func(self, options, args)
[100.104.10.132] out:   File "/export/home/hysdsops/verdi/lib/python3.9/site-packages/pip/_internal/commands/install.py", line 404, in run
[100.104.10.132] out:     installed = install_given_reqs(
[100.104.10.132] out:   File "/export/home/hysdsops/verdi/lib/python3.9/site-packages/pip/_internal/req/__init__.py", line 68, in install_given_reqs
[100.104.10.132] out:     uninstalled_pathset = requirement.uninstall(auto_confirm=True)
[100.104.10.132] out:   File "/export/home/hysdsops/verdi/lib/python3.9/site-packages/pip/_internal/req/req_install.py", line 670, in uninstall
[100.104.10.132] out:     uninstalled_pathset = UninstallPathSet.from_dist(dist)
[100.104.10.132] out:   File "/export/home/hysdsops/verdi/lib/python3.9/site-packages/pip/_internal/req/req_uninstall.py", line 533, in from_dist
[100.104.10.132] out:     assert (
[100.104.10.132] out: AssertionError: Egg-link /export/home/hysdsops/verdi/ops/osaka-1.0.6 does not match installed location of osaka (at /export/home/hysdsops/verdi/ops/osaka)
[100.104.10.132] out:
Fatal error: run() received nonzero return code 2 while executing!

• mitigates outstanding CVE's

[mcayanan]

LGTM