release identifier in 7 appends `-icedtea'

[Matthias Klose]

$ /usr/lib/jvm/java-7-openjdk/bin/java -version
java version "1.7.0_03-icedtea"
OpenJDK Runtime Environment (IcedTea7 2.1) (7~u3-2.1-1ubuntu2)
OpenJDK 64-Bit Server VM (build 22.0-b10, mixed mode)

given how much software parses the version identifier, and likely stumbles over 
the alpha characters, please can we remove it?  The origin of such a build is 
clearly documented with the 2nd and 3rd lines.

OpenJDK 6 /IcedTea 1.x doesn't have this extra branding.

   Matthias