Update default k8s version for GKE to 1.7.8 to avoid autoupgrade (#932)
Update default k8s version for GKE to 1.7.8 to avoid autoupgrade (#932)

during cluster creation.
leahnp/k2,samsung-cnct/kraken-lib,samsung-cnct/k2,alejandroEsc/k2,samsung-cnct/kraken-lib,alejandroEsc/k2,samsung-cnct/kraken-lib,leahnp/k2,samsung-cnct/k2,yenicapotediaz/k2,yenicapotediaz/k2