update script to print external dependencies for a target (#6102)
update script to print external dependencies for a target (#6102)

Allows you to print the external dependencies for a bazel target

Risk Level: Low

Testing: Ran the following bash script

./tools/print_deps_for_target.sh //source/exe:envoy

Signed-off-by: Dave Protasowski <4086e7437a691f9f091530e6ad7a43604b37f28e@gmail.com>
envoyproxy/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,envoyproxy/envoy,envoyproxy/envoy,dnoe/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,lizan/envoy,istio/envoy,istio/envoy,envoyproxy/envoy,jrajahalme/envoy,lyft/envoy,istio/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,eklitzke/envoy,dnoe/envoy,eklitzke/envoy,envoyproxy/envoy,envoyproxy/envoy,eklitzke/envoy,istio/envoy,istio/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy,lizan/envoy,envoyproxy/envoy-wasm,jrajahalme/envoy,lizan/envoy,lizan/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy,istio/envoy,dnoe/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,eklitzke/envoy,lizan/envoy,eklitzke/envoy,istio/envoy,lyft/envoy,eklitzke/envoy,lyft/envoy,lyft/envoy,dnoe/envoy,lyft/envoy,lyft/envoy,lizan/envoy,dnoe/envoy