[Rpm-maint] [rpm-software-management/rpm] Resolve --what<depends> arguments to package provides (PR #2451)

[Michael Schroeder]

Oh, and just one last note: there are basically three ways to to a --whatrequires query:

--whatrequires STRING
Which packages have the exact string as a dependency? STRING could maybe be a glob, we could support case insensitive searches, rich deps like `(foo if bar)` are allowed.

--whatrequires PROVIDES
Which packages have dependencies that match the specified provides capability. This is the current way rpm works except no EVR is allowed in the capability. (zypper supports that, it would probably be easy to add support to rpm). As with all provides, rich deps are forbidden.

--whatrequires LABEL
Which packages have dependencies that match all provides of the package(s) selected by LABEL. This is what repoquery does by default. Zypper suppors this with the option `--requires-pkg`. A rich dep does not work here. 

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