Address failing Go tests on go version from Ubuntu 14.04
Address failing Go tests on go version from Ubuntu 14.04

Go tests fail on Ubuntu 14.04's go1.2.1.  This change puts a minimum
go version in the skipUnlessGoInstalled() decorator of go1.3.0.
Go maintainers are encouraged to modify as needed.  For now this fixes
failing tests on Ubuntu 14.04 x86_64 buildbots with stock distro go installed.


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@249446 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb