Use unsupported device error message for SMB1

- Use more descriptive error message than the generic failure message when
failing to mount an SMB share because it is SMB1, which is unsupported.

TBR=baileyberro@chromium.org

(cherry picked from commit ccb3179be7746902b7d090574adfb67920e056be)

Bug: chromium:757625
Change-Id: I8293ce065293172cd3faacab7fac304908069f09
Reviewed-on: https://chromium-review.googlesource.com/1196009
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#587840}
Reviewed-on: https://chromium-review.googlesource.com/1256374
Cr-Commit-Position: refs/branch-heads/3538@{#813}
Cr-Branched-From: 79f7c91a2b2a2932cd447fa6f865cb6662fa8fa6-refs/heads/master@{#587811}
1 file changed