JDK-8037953 configure usability: Should provide better details on imported hotspot

[pointo1d]

Thanx all ,

Pls be advised that the comments have been incorporated and the webrev 
updated  - at http://cr.openjdk.java.net/~ngmr/8037953/webrev.01.

Rgds ,

-- 
​Dave Pointon FIAP MBCS

Now I saw, tho' too late, the folly of beginning a work before we count the cost and before we we judge rightly of our strength to go thro' with it - Robinson Crusoe