[Rpm-maint] [rpm-software-management/rpm] RFE: implement fast mode for getting EVR (#392)

[Igor Gnatenko]

@n3npq believe me, it is slowest part in my tool ;)

```
287.25user 152.95system 2:11.94elapsed 333%CPU (0avgtext+0avgdata 68724maxresident)k
13648inputs+0outputs (53major+30349595minor)pagefaults 0swaps
```

```diff
diff --git a/src/main.rs b/src/main.rs
index 4b0f2ff..9306517 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -79,6 +79,7 @@ fn run(opt: &Opt) -> Result<(), Error> {
             let atime = author.when();
             let datetime =
                 FixedOffset::east(atime.offset_minutes() * 3600 / 60).timestamp(atime.seconds(), 0);
+            /*
             let output = Command::new("rpmspec")
                 .args(&[
                     "--srpm",
@@ -92,6 +93,7 @@ fn run(opt: &Opt) -> Result<(), Error> {
                     workdir.join(&spec).to_str().unwrap(),
                 ])
                 .output()?;
+            */
 
             let mut chlog_header = format!(
                 "* {} {} <{}>",
@@ -99,11 +101,13 @@ fn run(opt: &Opt) -> Result<(), Error> {
                 author.name().unwrap_or("Nobody"),
                 author.email().unwrap_or("nobody at fedoraproject.org"),
             );
+            /*
             if output.status.success() {
                 chlog_header.push_str(&format!(" - {}", String::from_utf8_lossy(&output.stdout)));
             } else {
                 eprintln!("{}", String::from_utf8_lossy(&output.stderr));
             }
+            */
             let chlog_entry = format!("- {}", commit.summary().unwrap());
 
             Ok(Some(format!("{}\n{}", chlog_header, chlog_entry)))
```

```
13.41user 2.05system 0:03.20elapsed 482%CPU (0avgtext+0avgdata 66184maxresident)k
0inputs+0outputs (0major+495394minor)pagefaults 0swaps
```

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