[Rpm-maint] [rpm-software-management/rpm] Add a rpm-lua(7) man page for the embedded Lua interpreter (PR #3809)

[Panu Matilainen]

@pmatilai commented on this pull request.



> +	```
+
+*unsetenv(*_name_*)*
+	Remove a variable _name_ from environment. See also *unsetenv*(3).
+
+	Example:
+	```
+	posix.unsetenv('HOME')
+	```
+
+# Extending and customizing
+On initialization, RPM executes a global _init.lua_ Lua initialization script,
+typically located in _/usr/lib/rpm/init.lua_. This can be used for performing
+custom runtime configuration of RPM and adding global functions and variables
+to the RPM Lua environment without recompiling RPM.
+

Actually that subject doesn't really belong to this section. I added separate mentions to macros, where it'll always be a global shared space, and another one to the scriptlet section stating they should not make such assumptions.

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