[Rpm-maint] [rpm-software-management/rpm] expression expansion (#834)

[Michael Schroeder]

There's a lot of expansion going on in the %expr macro. Witness this:

./rpm --eval '%{expr: "%%%%%%%%"}'
%

The string gets expanded
- at the start of doFoo when it expands the argument
- in rdToken when it parses a string
- at the end of doFoo  because of issue #313

I'm somewhat surprised that rdToken expands strings and that this hasn't messed up some `%if` statements yet.
It's also somewhat inconsistent that the integer case does not do expansion.

I kind of like to have the expansion in rdToken instead of doFoo because:

- It makes `"%str"` work when %str contains a `"` character.
- It allows to have short circuit semantics

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https://github.com/rpm-software-management/rpm/issues/834
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