get_binhost.py: Support manifest paths without trailing slashes

At least for the internal manifest on tatl, I'd see 'Unknown manifest
source
https://chrome-internal.googlesource.com/chromeos/manifest-internal'
with no trailing slash. Support with or without.

BUG=None
TEST=get_binhost.py tatl

Change-Id: I102c248baaa17cb91c6f35bf1c92eb740bce467c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2963802
Reviewed-by: David Munro <[email protected]>
Reviewed-by: Fergus Dall <[email protected]>
Commit-Queue: David Munro <[email protected]>
Tested-by: David Munro <[email protected]>
Auto-Submit: David Munro <[email protected]>
1 file changed