JDK 8u release renumbering: FX 8u-dev is now 8u102

[Kevin Rushforth]

The recently released JDK 8u77 release requires a renumbering for 
subsequent releases.

Fixes going into openjfx 8u-dev are now targeted for 8u102. The 
fixVersion in JBS has been adjusted to reflect this. Please keep this in 
mind when pushing any approved fixes to 8u-dev. This is for the July 
quarterly PSU release.

Also, as an FYI, the April quarterly PSU release has been renamed from 
8u76 to 8u92.

-- Kevin