[feature/capgen-v1]: Test for issue 772 in capgen v0, fix for issue 774 (name collision in capgen v1)

[climbfuji]

Description

Note. This PR contains the changes from #773 - it must be updated after #773 is merged into feature/capgen-v1.

1. Fix for issue v1: two host variables sharing a local name with different standard names will compile but clobber silently #774 - host module import name clash with control variables passed via argument list, plus tests. Instead of implementing some black magic, we simply bail out and instruct the user to fix the name collision. This is easy - simply change the "local name" in the type = control metadata table, which is only used as as the l.h.s. in the explicit argument lists to the CCPP calls (call ccpp_physics_run etc.) and then passed down to the suite and group caps.
2. Also: tests for issue Local name collisions in generated group caps #772 in capgen v0 (not an issue in v1, but adding the same test to demonstrate).

User interface changes?: No

Fixes: #774

Testing: all pass
test removed:
unit tests: added tests to cover the situation in #774
system tests:
end-to-end tests: updated advection test to match #771
manual testing:

[climbfuji]

@jimmielin FYI

[dustinswales]

LGTM

[peverwhee]

thanks @climbfuji !

a couple requests; and a question

[climbfuji]

Same as for #773, merging into feature/capgen-v1 with NOAA and NCAR approvals, and because reviewers can look at an earlier commit on the feature/capgen-v1 branch.