Fix s3tool to adopt new aws.Config fields.
Fix s3tool to adopt new aws.Config fields.

  + See https://github.com/aws/aws-sdk-go/commit/52c7ce745f48aaff701d1614891e02c7fec1b7ff

[Fixes #100062104]

Signed-off-by: Colin Jackson <4f4efc23f45cfd2ccaeb623d4ab84100edb791f6@pivotal.io>

datachand/lattice,svrc-pivotal/lattice,svrc-pivotal/lattice,SrinivasChilveri/lattice,davidwadden/lattice,SrinivasChilveri/lattice,Klaudit/lattice,svrc-pivotal/lattice,davidwadden/lattice,svrc-pivotal/lattice,Klaudit/lattice,Klaudit/lattice,cloudfoundry-incubator/ltc,datachand/lattice,datachand/lattice,datachand/lattice,davidwadden/lattice-release,felipeg48/lattice,felipeg48/lattice,cloudfoundry-incubator/ltc,SrinivasChilveri/lattice,Klaudit/lattice,SrinivasChilveri/lattice,davidwadden/lattice-release