- Move SCRATCHDIR to ./tmp and add it to .gitignore
- Move logs to ./logs and add it to .gitignore
- Add build.conf to .gitignore
- Rename BUILDER_TOOLS to BUILDER_ROOT that makes more sense in new
infrastructure
- Change some (cd DIR && git) to git -C DIR
- Remove BASE_DIR
- Remove TOOLS_DIR
- Remove update_product_repository()
- Remove TOOLS_*_COMMIT variables
- Rename PRODUCT_CURRENT_COMMIT and PRODUCT_LAST_COMMIT to simply
CURRENT_COMMIT and LAST_COMMIT
- Remove all use of GIT_REPO_DIR, GIT_REPO_UTL and GIT_REPO_TOOLS
- Change clone_to_staging_area() to clone ./src instad of ./
- Detect if script was called from / or /tools and set BUILDER_ROOT
and BUILDER_SCRIPTS properly
- Create SCRATCHDIR if it doesn't exist
