Allow more PATH tools, expose HOST_STRIP

atree was using the host's strip tool during sdk generation, so expose
the prebuilt for use instead.

`id` was used with a test running minijail0 during the build

`sha1sum` is used by development/build/tools/mk_sdk_repo_xml.sh

`rmdir` was being used to remove some tmp files

Test: m PRODUCT-sdk_arm64-sdk dist sdk_repo
Test: Run other builds through forrest
Change-Id: I49c756a3e9497c0bbd9030754e6aa193a2d989a4