use susv3 head arguments

Without enabling INCLUDE_SUSv2 in busybox, we need to use head's -n argument,
rather than -#.

Signed-off-by: Christopher Larson <kergoth@gmail.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
Fix lxc-stop's argument parsing

Change lxc-stop's argument parsing so that it matches what the help option
and the man page both describe.

Signed-off-by: Robert Vogelgesang <vogel@users.sourceforge.net>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
lxc-ubuntu-cloud: various small changes

 * ppc64el images now exist and generally function.
   Instead of failing because an arch isnt in the list,
   let that check happen by ability to download something.
 * update the hard coded ubuntu releases to know about 'trusty'
   and drop no longer supported releases (consistent with behavior
   when distro-info is available)
 * shorten the logic that decides if host and container arch
   are supported.
 * support skipping "invalid arch" check entirely via undocumented
   variable UCTEMPLATE_SKIP_ARCH_CHECK.
 * update usage to reference 'tryreleased' as the default 'stream'
 * give good error message if user tries 'released' and there
   is no released version available.

Signed-off-by: Scott Moser <smoser@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
lxc-ubuntu-cloud: Update arm* cross

| host arch | arm64 | armhf | armel |
-------------------------------------
| arm64     |   X   |   X   |   X   |
| armhf     |       |   X   |   X   |
| armel     |       |   X   |   X   |
-------------------------------------

Although optional, all existing arm64 silicon supports 32bit instructions.
armel/armhf is only a userspace change, so they are interchangeable.
However armhf isn't supported on all armel platforms (e.g. armv6) but
all those we support have hard-float.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>