Removed long time off-line slave and it's builder.

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@205813 91177308-0d34-0410-b5e6-96231b3b80d8
Done some code cleaning mostly related to obsolete builders LLVMGCCBuilder, ScriptedBuilder, DragonEggBuilder.

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@205815 91177308-0d34-0410-b5e6-96231b3b80d8