`make dev-tests-clean` is broken: Argument list too long

[Dan Bonachea]

On dirac, with four networks detected:

$ make dev-tests-clean
...
gmake[2]: /bin/bash: Argument list too long
gmake[2]: *** [/redacted/upcxx/bld/Makefile.tests:361: tests-clean] Error 127
gmake[1]: *** [/redacted/upcxx/bld/Makefile.tests:533: dev-tests-clean] Error 2
gmake: *** [/redacted/upcxx/bld/Makefile.rules:107: dev-tests-clean] Error 2

Even when it works, dev-tests-clean and tests-clean also generate a LARGE amount of output listing all possible test names, that should probably be suppressed.

[Paul Hargrove]

Repair make dev-tests-clean (issue #406)

This commit repairs the make dev-tests-clean rule, reported as broken in issue #406, by breaking it into explicit iteration over all the possible networks. The observation in that issue regarding verbosity is also addressed at the same time.

Resolves issue #406

→ <<cset 6381f6176642>>