skyring: Fix lsb_release command not found
skyring: Fix lsb_release command not found

lsb_release is installed post cluster creation.
But, post node accept, the node listing page displays
command not found error as its still not installed.
So, this patch, fixes it by using salt grains instead
of lsb_release.

Change-Id: I1b13b5bf8edd3da06cd690305aebc8de27820686
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1313697
Signed-off-by: anmolbabu <3d38fb1e9c5ff2662fc415254efcdfedb95b84d5@gmail.com>

skyrings/skyring,skyrings/skyring,skyrings/skyring,skyrings/skyring