Backed out 5 changesets (bug 1766497) for causing build bustages with "No module named 'encodings'" CLOSED TREE

Backed out changeset 09f7f3d1c6dd (bug 1766497)
Backed out changeset 6bb5f754957a (bug 1766497)
Backed out changeset aedf2d7af408 (bug 1766497)
Backed out changeset 394555265c86 (bug 1766497)
Backed out changeset 41be40696e00 (bug 1766497)