Revert to getting a random port and sending that down to debugserver for iOS. The sandboxing is not letting debugserver reverse connect back to lldb.

<rdar://problem/15789865>



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@198963 91177308-0d34-0410-b5e6-96231b3b80d8