Processing PowerInfo broadcast async

[ajadusum]

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Issue: PowerInfoReceiver in HttpClient is processing broadcast on main thread. Android guideline is to avoid working on main thread on broadcast.

Fix: HttpClient already has a executor, processing the broadcast message async on the executor.

[lalitb]

@ajadusum The android build is failing. Can you check if this is related to your changes ?

[ajadusum]

@ajadusum The android build is failing. Can you check if this is related to your changes ?

Yes, a test is failing. I will fix the mocks tomorrow.