Merge remote-tracking branch 'upstream/master' into staging

Conflicts:
	pkgs/build-support/fetchbower/default.nix
	pkgs/build-support/fetchdarcs/default.nix
	pkgs/build-support/fetchgx/default.nix
	pkgs/development/python-modules/botocore/default.nix
	pkgs/os-specific/linux/firmware/firmware-linux-nonfree/default.nix
	pkgs/tools/admin/awscli/default.nix