Add a -remote-file option to “target create” to specify the location of the executable on a remote system (if debugging remotely using debugserver on the target system.)  This gets us closer to being able to set up a remote debugging session from the lldb command line.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@186050 91177308-0d34-0410-b5e6-96231b3b80d8