Add 'framework/drupal7/istribute/sdk/' from commit 'a8f80efb019eca251507e9adda88a4e2872da02d'

git-subtree-dir: framework/drupal7/istribute/sdk
git-subtree-mainline: da7fdcaab5b0b0aec93a6a952fcedae5b1612dc9
git-subtree-split: a8f80efb019eca251507e9adda88a4e2872da02d