Fix #7026 adding a new wol parameter

[titilambert]

Description:

#6810 introduced a bug on WOL component.
This patch fixes this issue by adding a new parameter to specify the broadcast address where the magic packet should be sent. See the example below.
@goto100 could you confirm that this patch work fine for you ? (be careful, you have to change your configuration)

Related issue (if applicable): fixes #7026

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#2445

Example entry for configuration.yaml (if applicable):

switch:
  - platform: wake_on_lan
    mac_address: "00-01-02-03-04-05"
    name: myhost
    host: 192.168.2.13
    broadcast_address: 255.255.255.255

Checklist:

• Documentation added/updated in home-assistant.github.io
• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

[mention-bot]

@titilambert, thanks for your PR! By analyzing the history of the files in this pull request, we identified @fabaff, @Chris-V and @iamtpage to be potential reviewers.

[mikenolet]

This corrected the issue for me.

[mikenolet]

I tried it again today under 42.4 and it does not appear to work.

[titilambert]

@mikenolet it seems merge in 0.43