Update Cilium version to v1.17.5 (#56)

* update cilium version to 1.15.17 (with docker image from non-ACR)

* update the docker image from our own ACR with Ubuntu update

* update cilium version to v1.17.5

* enable host legacy porting

* change docker image pull policy to Always

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Co-authored-by: Rui Gao <[email protected]>

Author: hippogr