Alpine template does not install extra package

[BegBlev]

When creating an Alpine container on some systems, extra packages are not installed.

For instance, on Ubuntu 16.04, the following command won't actually install squid package.

lxc-create -t alpine -n mycontainer -- squid

My understanding of the reason of this behavior is the following.
On Ubuntu, /bin/sh points to /bin/dash. With dash (POSIX shell), assigning "$@" to a variable is not working as with bash. Only the first element of the array is actually assigned.

However, in file lxc-alpine.in, line 267, such an assignment is done.

local packages="$@"

Actually, as install_packages function is called with exactly 2 arguments, I propose to replace the first 2 lines of this function

local arch="$1"; shift
local packages="$@"

by

local arch="$1"
local packages="$2"

I will submit a pull request very soon

Regards
Vincent