feat(vcs clients filtering): added changes related to vcs client filtering needed for EE. Fixes: RCCE-41

docs: added 5.1.2 rel notes

Bump version: 5.1.1 → 5.1.2

release: Bump version 5.1.1 to 5.1.2

feat: security tab in admin, routes and placeholder view for ee functionality

fix(deps): bring back pyramid-mako removed in debugtoolbar

feat(artifacts): new artifact storage engines allowing an s3 based uploads

chore(deps): updated dependencies, and removed debugtoolbar from prod build

chore(makefile): updated makefile data

chore(configs): droped unused configs