checkpoint: setPageServer: use net.SplitHostPort instead of strings.Split
checkpoint: setPageServer: use net.SplitHostPort instead of strings.Split

strings.Split() isn't the best solution for this, as it will not handle (e.g.)
IPv6 addresses.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

estesp/runc,estesp/runc,dqminh/runc,xiaochenshen/runc,rhatdan/runc,kolyshkin/runc,dqminh/runc,opencontainers/runc,kolyshkin/runc,dqminh/runc,rhatdan/runc,rhatdan/runc,opencontainers/runc,rhatdan/runc,xiaochenshen/runc,dqminh/runc,kolyshkin/runc,opencontainers/runc,opencontainers/runc,estesp/runc,kolyshkin/runc,xiaochenshen/runc