Copy dependency on st2-auth-backend-pam from st2-packages.git

[cognifloyd]

st2-packages.git has been injecting another dependency since 2016 (StackStorm/st2-packages@d35c03e):

git+https://github.com/StackStorm/st2-auth-backend-pam.git@master#egg=st2-auth-backend-pam

https://github.com/StackStorm/st2-packages/blob/7ed6bf12d101aa34456b711723be9f81d3be82d7/packages/st2/in-requirements.txt#L8

The legacy Makefile gets the dep indirectly via st2-packages.git, but that will be archived when we start using pants to build packages. So, this PR copies that requirement into pants-requirements.txt here (and to st2auth/in-requirements.txt):

st2/requirements-pants.txt

Line 81 in f350445

st2-auth-backend-pam @ git+https://github.com/StackStorm/st2-auth-backend-pam.git@master

Then, since pants can't infer a dep on plugins like this, we explicitly add the dep here:

st2/BUILD

Lines 63 to 68 in f350445

	target(
	name="auth_backends",
	dependencies=[
	"//:reqs#st2-auth-backend-flat-file",
	"//:reqs#st2-auth-ldap",
	"//:reqs#st2-auth-backend-pam",

Finally, I regenerated lockfiles/st2.lock and copied the updated pins to the legacy requirements files. Here's the lockfile diff:

Lockfile diff: lockfiles/st2.lock [st2]

==                    Upgraded dependencies                     ==

  decorator                      5.1.1        -->   5.2.1
  psutil                         6.1.1        -->   7.0.0
  simplejson                     3.19.3       -->   3.20.1

==                      Added dependencies                      ==

  st2-auth-backend-pam           0.4.0

NB: The psutil major version bump merely drops support for python 2.7 and a deprecated method that we do not use.

[nzlosh]

Looks like the sample file needs to be regenerated for linting to pass. Please run "make configgen" and include and commit the generated file.

[cognifloyd]

I'm going to have to add this to the legacy requirements as well.

[nzlosh]

Good find by the way 💯