Clean hotfix directory before patching the srpm contents

For those of us who don't patch the srpm contents correctly the first or
even second time, we should do something like make clean before we extract
the srpm, patch things, and attempt to rpmbuild.

lib/manageiq/rpm_build/build_hotfix.rb

@@ -14,6 +14,7 @@ def generate_rpm
         where_am_i
 
         Dir.chdir(HOTFIX_DIR) do
+          clean_hotfix_directory
           unpack_srpm
           update_spec
           copy_patches
@@ -64,6 +65,11 @@ def update_spec
         File.write(rpm_spec, spec_text)
       end
 
+      def clean_hotfix_directory
+        files = Dir.glob("*").reject {|path| path.end_with?("src.rpm") }
+        FileUtils.rm_f(files, :verbose => true)
+      end
+
       def unpack_srpm
         srpm = Dir.glob("*.src.rpm").first
         shell_cmd("rpm2cpio #{srpm} | cpio -idmv")