Use INFO color as defined in: Bug 505738 – Define a information hover
color which JDT, CDT or others can use 

Change-Id: I37e18faa679ca6a328a83c3cce0083de0872d1f7
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=507067
Signed-off-by: Leo Ufimtsev <lufimtse@redhat.com>