Relevant pylint warnings fixed (#164).

conanfile.py

-import os
-
-from conans import ConanFile, CMake, tools
+from conans import ConanFile, CMake
 
 
 class ScopeguardConan(ConanFile):
         "trompeloeil/v34@rollbear/stable"
     )
 
-
     def _configure_cmake(self):
         cmake = CMake(self)
         cmake.configure(source_folder=self._source_dir, build_folder="build")