For SLES11 SP1 replace SLE_11_SP2 with SLE_11_SP1, for SLES10 replace it with SLE_10.
Verify the key and decide if you want to trust it.
Run updateSupportutils which installs supportconfig.
For details on supportconfig and Zypper execute man supportconfig and man zypper.
Fixes and workaround to avoid issues caused by Leap Second 2015.