Fix service filtering by name on Kubernetes

[silvin-lubecki]

- What I did
Fix #1092 by filtering services by name but client side.

- How to verify it

# Deploy a stack with multiple services
$ docker stack deploy mystack -c docker-compose.yml --orchestrator=kubernetes

# Docker service matches exact name
$ docker stack service mystack --filter name=my-service --orchestrator=kubernetes
ID                  NAME                   MODE                REPLICAS            IMAGE                 PORTS
af5e0438-634        mystack_my-service     replicated          0/1                 docker-teaches-code   *:8080->8080/tcp

# But also prefix
$ docker stack service mystack --filter name=my-se --orchestrator=kubernetes
ID                  NAME                   MODE                REPLICAS            IMAGE                 PORTS
af5e0438-634        mystack_my-service     replicated          0/1                 docker-teaches-code   *:8080->8080/tcp

- Description for the changelog
Fix #1092 filtering stack service name by prefix

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

Would it be clearer to pass names []string as argument instead of the filter-set?

[vdemeester]

SGTM with @thaJeztah's comment taken care of :)

[silvin-lubecki]

PTAL

[thaJeztah]

LGTM

[vdemeester]

LGTM 🐯