[Rpm-maint] [rpm-software-management/rpm] Short option for SCM setting. (#564)

[Panu Matilainen]

Okay so I do see some real-world uses for specifying temporary scm from the cli, such as not wanting backups by default but needing to rediff, so you might want to specify "gendiff" on an occasion. Or not wanting the overhead of git or other real scm for regular builds but wanting to use git for bisecting between patches. 

My biggest problems with this are
1) the apparent promise of scm interchangeability when they are not, I think this needs a disclaimer in the man page
2) use of a single letter option for what is quite a rare use

If it's changed to --scm=<SCM> and the use (and limitations) explained in the manual, I'd be okay merging it.

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