regen-gapic.sh: add containeranalysis API
regen-gapic.sh: add containeranalysis API

Change-Id: I86564932f3d6caed2229490b5dd0229a16249142
Reviewed-on: https://code-review.googlesource.com/31692
Reviewed-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Jean de Klerk <605b93664484fed1e671a07bff68da39e73d0174@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go