luci-app-lxc: Allow versioned images

I makes quite some sense to provide user the choice between various versions of
the distribution to install into LXC.

Signed-off-by: Michal Hrusecky <michal.hrusecky@nic.cz>

utils/luci-app-lxc/files/controller/lxc.lua

@@ -80,7 +80,10 @@ function lxc_create(lxc_name, lxc_template)
 
 	local target = _G.DISTRIB_TARGET:match('([^/]+)')
 
-	local data = conn:call("lxc", "create", { name = lxc_name, template = "download", args = { "--server", url,  "--no-validate", "--dist", lxc_template, "--release", "bb", "--arch", target } } )
+	local lxc_dist = lxc_template:gsub("(.*):(.*)", '%1')
+	local lxc_release = lxc_template:gsub("(.*):(.*)", '%2')
+
+	local data = conn:call("lxc", "create", { name = lxc_name, template = "download", args = { "--server", url,  "--no-validate", "--dist", lxc_dist, "--release", lxc_release, "--arch", target } } )
 
 	luci.http.write(data)
 end

utils/luci-app-lxc/files/view/lxc.htm

@@ -47,7 +47,7 @@ Author: Petar Koretic <petar.koretic@sartura.hr>
 				</td>
 				<td>
 					<select id="s_template" class="cbi-input-select cbi-button">
-						<option value="openwrt">OpenWrt</option>
+						<option value="openwrt:bb">OpenWrt BB</option>
 					</select>
 				</td>
 				<td>