fix(tests): Fix the cookies disabled functional tests.
fix(tests): Fix the cookies disabled functional tests.

The tests were not setting the implicit wait timeout and were timing out
immediately. Converted direct page fetches to use FunctionalHelpers.openPage to
reduce boilerplate and set the timeout.

fixes #3066

npestana/fxa-content-server,swatilk/fxa-content-server,vladikoff/fxa-content-server,npestana/fxa-content-server,vladikoff/fxa-content-server,swatilk/fxa-content-server,swatilk/fxa-content-server,mozilla/fxa-content-server,vladikoff/fxa-content-server,mozilla/fxa-content-server,npestana/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,shane-tomlinson/fxa-content-server,shane-tomlinson/fxa-content-server