OSFamily to be used for the slave. One of AIX, ARCH, CENTOS, DARWIN, DEBIAN, ESX, FEDORA, FREEBSD, GENTOO, HPUX, LINUX,AMZN_LINUX, MANDRIVA, NETBSD, OEL, OPENBSD, RHEL, SIGAR, SOLARIS, SUSE, TURBOLINUX, UBUNTU, WINDOWS. Please note that currently only Linux based slaves are tested.