Added line limit exemptions for 'variant' and 'version' directives.

Updated the 'scotch' package to use oneline 'variant' directives.

share/spack/qa/run-flake8

@@ -20,12 +20,17 @@ fi
 # Check if changed files are flake8 conformant [framework]
 changed=$(git diff --name-only develop... | grep '.py$')
 
-# Exempt url lines in changed packages from overlong line errors.
-# Exempt functions defined with '@when' decorator from redefinition errors.
+# Add approved style exemptions to the changed packages.
 for file in $changed; do
     if [[ $file = *package.py ]]; then
         cp "$file" "$file~"
+
+        # Exempt lines with urls and descriptions from overlong line errors.
         perl -i -pe 's/^(\s*url\s*=.*)$/\1  # NOQA: ignore=E501/' $file
+        perl -i -pe 's/^(\s*version\(.*\).*)$/\1  # NOQA: ignore=E501/' $file
+        perl -i -pe 's/^(\s*variant\(.*\).*)$/\1  # NOQA: ignore=E501/' $file
+
+        # Exempt '@when' decorated functions from redefinition errors.
         perl -i -pe 's/^(\s*\@when\(.*\).*)$/\1  # NOQA: ignore=F811/' $file
     fi
 done