Pilight Switch rejects alphanumeric IDs

[DavidLP]

Description:
The last PR #5223 stalled, thus this is a minimum change PR fixing regression #5119.

Related issue (if applicable): fixes #5119

Example entry for configuration.yaml (if applicable):

pilight:
  host: 127.0.0.1
  port: 5000
switch:
- platform: pilight
  switches:
    light:
      on_code:
        protocol: intertechno_old
        unit: 3
        id: 'A1'
        'on': 1
      off_code:
        protocol: intertechno_old
        unit: 3
        id: 'A2'
        'off': 1
      on_code_receive:
        protocol: daycom
        state: 'off'
      off_code_receive:
        protocol: daycom
        state: 'on'

Checklist:

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

[mention-bot]

@DavidLP, thanks for your PR! By analyzing the history of the files in this pull request, we identified @fabaff and @janLo to be potential reviewers.

[DavidLP]

Travis py34 env fails in unrelated components.