dev_container: Add --podman command line parameter
dev_container: Add --podman command line parameter

The parameter defaults to true if docker is not installed. This also
resolves previous issues with resolving which docker command to use.

A warning is added when executing dev_container with podman.

BUG=b:233346153
TEST=./tools/dev_container --podman

Change-Id: I1d3dad6a657c0273c82634e409a0991245f56f4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3657814
Reviewed-by: Anton Romanov <7c8c28e1283c1d87f2c3df4d6b5c74b6ae02bcd9@google.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

google/crosvm,google/crosvm,google/crosvm,google/crosvm