Autocomplete - Prompt appears on initial page load even when component does not have focus

[sri-viswanathan]

Describe the bug
The promptMessage appears on initial page load even when the component does not have focus

To Reproduce
Steps to reproduce the behavior:

1. Go to a page in an app that uses the Autocomplete component and where it does not receive focus on page load
2. Ensure that the Autocomplete component is set up to display a promptMessage based on a promptCondition
3. Refresh the page
4. Note that the promptMessage is visible even though the Autocomplete component does not have focus

Expected behavior
The promptMessage and promptCondition should kick in only when the Autocomplete field explicitly has focus.

Please follow the following instruction to create the new branch:

git checkout release/0.6
git pull
git checkout -b 'feature/autocomplete-prompt

[daniele-zurico]

Closed by #357