Remove vtadmin-down.sh from teardown.sh

[doeg]

Signed-off-by: Sara Bee 855595+doeg@users.noreply.github.com

Description

This removes vtadmin-down.sh from teardown.sh in order to avoid errors like the following:

cat: ~/go/src/vitess.io/vitess/examples/local/vtdataroot/tmp/vtadmin-web.pid: No such file or directory
./scripts/vtadmin-down.sh: line 6: kill: `': not a pid or valid job spec
Stopping vtadmin-api...
cat: ~/go/src/vitess.io/vitess/examples/local/vtdataroot/tmp/vtadmin-api.pid: No such file or directory
./scripts/vtadmin-down.sh: line 9: kill: `': not a pid or valid job spec

I plan to add vtadmin-up to the local example scripts at the same time as (a) #10118 (to avoid introducing node as a prerequisite for running ./101...) and (b) vitess.io documentation.

Related Issue(s)

N/A

Checklist

• "Backport me!" label has been added if this change should be backported
• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

N/A

[frouioui]

lgtm!