Update docker with build-in sudo

[wli3]

To reduce the chance of build failure. Currently we need to download sudo for every build and due to network failure it could fail. The following images have build-in sudo.

dotnet/dotnet-buildtools-prereqs-docker#75

mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-afc9dca-20190328175133
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-18.04-debpkg-cfdd435-20190328175133
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-17.10-afc9dca-20190328175132
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-17.10-debpkg-cfdd435-20190328175132
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-afc9dca-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-debpkg-cfdd435-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-coredeps-d770b8b-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-coredeps
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-crossdeps-cfdd435-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-crossdeps
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-arm64-cfdd435-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-arm64-alpine-cfdd435-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-cfdd435-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-mlnet-207e097-20190328175112
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-afc9dca-20190328175106
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-debpkg-cfdd435-20190328175106
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-coredeps-4e6e894-20190328175106
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-coredeps
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-crossdeps-cfdd435-20190328175106
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-crossdeps
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-cross-cfdd435-20190328175106
mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-29-afc9dca-20190328175057
mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-29-helix-c6dc5e6-20190328175057
mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-28-afc9dca-20190328175057
mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-28-helix-45b1fa2-20190328175057
mcr.microsoft.com/dotnet-buildtools/prereqs:debian-jessie-coredeps-58e4974-20190328175052
mcr.microsoft.com/dotnet-buildtools/prereqs:debian-jessie-afc9dca-20190328175052
mcr.microsoft.com/dotnet-buildtools/prereqs:debian-jessie-debpkg-58e4974-20190328175052
mcr.microsoft.com/dotnet-buildtools/prereqs:debian-jessie-corert-58e4974-20190328175052
mcr.microsoft.com/dotnet-buildtools/prereqs:debian-stretch-docker-testrunner-63f2145-20190328175052
mcr.microsoft.com/dotnet-buildtools/prereqs:debian-stretch-afc9dca-20190328175052
mcr.microsoft.com/dotnet-buildtools/prereqs:opensuse-42.3-afc9dca-20190328191913
mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-afc9dca-20190328192013
mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-mlnet-8bba86b-20190328192013
mcr.microsoft.com/dotnet-buildtools/prereqs:centos-6-afc9dca-20190328192030