[Rpm-maint] [rpm-software-management/rpm] RFE: Handle DistTag (#589)

[wladmis]

@Conan-Kudo recently I take a brief look at OpenMandriva Lx3. It uses `%name-%version-%release-%disttag%distepoch.%arch.rpm` for filename, each of its rpm package provides `name = %|epoch?{%{epoch}:}|%version-%release:%distepoch`, which is nice.

There is no `distepoch` in `rpm.org`, and in ALT there are different branches with no linear order, so I propose follow format for package matching:

`name[-[epoch:]version[-release]][:disttag][.arch]`,

and may be `%name = %|epoch?{%{epoch}:}|%version-%release:%disttag` to package provides,

and `%name-%version-%release:%disttag.%arch.rpm` for package filename.

Package format for `dbiFindByLabelArch()` to match: `name[-[epoch:]version[-release]][:disttag][.arch]`.

@Conan-Kudo @ignatenkobrain @pmatilai @ffesti are you agree with that? If you are then I will write the code to PR.

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