add l2 advertisment to metallb add clientset and tests

[marcushines]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 3054150569

• 115 of 153 (75.16%) changed or added relevant lines in 4 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 59.47%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
deploy/deploy.go	10	13	76.92%
api/metallb/clientset/v1beta1/client.go	9	16	56.25%
api/metallb/clientset/v1beta1/ipaddresspool.go	48	62	77.42%
api/metallb/clientset/v1beta1/l2advertisement.go	48	62	77.42%

Files with Coverage Reduction	New Missed Lines	%
api/metallb/clientset/v1beta1/client.go	2	63.04%

Totals
Change from base Build 3045602664:	0.3%
Covered Lines:	2355
Relevant Lines:	3960

---

💛 - Coveralls

[marcushines]

Validated this with 3node-withtraffic

hines@hines-1:~/go/src/github.com/openconfig/kne$ ssh admin@192.168.16.55
Warning: Permanently added '192.168.16.55' (ED25519) to the list of known hosts.
(admin@192.168.16.55) Password:
Last login: Wed Sep 14 15:27:23 2022 from 10.244.0.1
r1#show ver
Arista cEOSLab
Hardware version:
Serial number:
Hardware MAC address: 0e6e.fd5e.ed77
System MAC address: 0e6e.fd5e.ed77

cEOS tools version: 1.1
Kernel version: 5.17.11-1rodete2-amd64

Uptime: 19 minutes
Total memory: 185667384 kB
Free memory: 153913248 kB

r1#