host_linux: Skip everything that isn't a normal process.
host_linux: Skip everything that isn't a normal process.

host_darwin does the same filtering. Not doing this gives us some rather strange
entries that likely aren't what we want.

Before:
    {"user":"reboot","terminal":"~","host":"3.10.0-327.4.5.el7.x86_64","started":1454378260}
    {"user":"LOGIN","terminal":"ttyS0","host":"","started":1454378270}
    {"user":"LOGIN","terminal":"tty1","host":"","started":1454378270}
    {"user":"runlevel","terminal":"~","host":"3.10.0-327.4.5.el7.x86_64","started":1454378276}
    {"user":"root","terminal":"pts/0","host":"vpn","started":1454404513}

After:
    {"user":"root","terminal":"pts/0","host":"vpn","started":1454404513}

influxdb/gopsutil,influxdb/gopsutil