Option defaults in API must be the same as in CLI.
```
% podman image push --help
% podman image pull --help
% podman manifest push --help
% podman image search --help
```
All of these CLI commands them have --tls-verify=true by default:
```
--tls-verify require HTTPS and verify certificates when accessing the registry (default true)
```
As for `podman image build`, it doesn't have any means to control
`tlsVerify` parameter but it must be true by default.
Signed-off-by: Vladimir Kochnev <hashtable@yandex.ru>
52a4642edd