lxc-create: Support passing a full path to -t

doc/lxc-create.sgml.in

@@ -113,6 +113,8 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 	    eg. busybox, debian, fedora, ubuntu or sshd.
 	    Refer to the examples in <filename>@LXCTEMPLATEDIR@</filename>
 	    for details of the expected script structure.
+	    Alternatively, the full path to an executable template script
+	    can also be passed as a parameter.
 	  </para>
 	</listitem>
       </varlistentry>

src/lxc/lxc-create.in

@@ -290,14 +290,20 @@ if [ $backingstore = "lvm" ]; then
 fi
 
 if [ ! -z $lxc_template ]; then
+    # Allow for a path to be provided as the template name
+    if [ -x $lxc_template ]; then
+        template_path=$lxc_template
+    else
+        template_path=${templatedir}/lxc-$lxc_template
+    fi
 
-    type ${templatedir}/lxc-$lxc_template 2>/dev/null
+    type $template_path 2>/dev/null
     if [ $? -ne 0 ]; then
         echo "$(basename $0): unknown template '$lxc_template'" >&2
         cleanup
     fi
 
-    ${templatedir}/lxc-$lxc_template --path=$lxc_path/$lxc_name --name=$lxc_name $*
+    $template_path --path=$lxc_path/$lxc_name --name=$lxc_name $*
     if [ $? -ne 0 ]; then
         echo "$(basename $0): failed to execute template '$lxc_template'" >&2
         cleanup