Squashed 'external/devlib/' changes from 2e81a72b..8871fe3c

8871fe3c devlib/sched: Change order of CPU capacity algorithms
aa50b2d4 host: expect shell syntax inside LocalConnection.execute
ebcb1664 utils/version: Development version bump
0ff8628c utils/version: Version bump
c0d8a98d setup.py: Use version_helper to generate devlib version
441eea98 devlib/version: Implement devlibs version as a namedtuple
b0db2067 target: Fix missing import for Python3
1417e816 target/HexInt: Fix to inherit from long instead of int.

git-subtree-dir: external/devlib
git-subtree-split: 8871fe3c256b8473813b619ae21928509f670e54