fsautocomplete integration tests inconsistent because of helptext

[rneatherway]

Because the helptext is returned synchronously, if it isn't ready then "(loading description...)" is returned. This cause problems on slow machines (like the CI environment). To work around this large waits have been inserted in the JSON tests (plain text doesn't support helptext), which works most of the time, but is ugly and unpredictable.

For testing we could instead use DescriptionTextAsync which 'Never returns "Loading...".' as mentioned here: http://fsharp.github.io/FSharp.Compiler.Service/reference/microsoft-fsharp-compiler-sourcecodeservices-fsharpdeclarationlistitem.html

[rneatherway]

This issue was moved to ionide/FsAutoComplete#22