unitctl: Don't track unit-openapi/.openapi-generator/

The two files under unit-openapi/.openapi-generator/, FILES and VERSIONS
are auto-generated.

Signed-off-by: Andrew Clayton <[email protected]>

Author: ac000

tools/unitctl/unit-openapi/.gitignore

@@ -1,3 +1,4 @@
+.openapi-generator/
 /target/
 **/*.rs.bk
 Cargo.lock