Currently, if we execute 'process load' with remote debugging, it uses
the host's path delimiter to look up files on a target machine. If we
run remote debugging of Linux target on Windows and execute "process
load C:\foo\a.so", lldb-server tries to load \foo\a.so instead of
/foo/a.so on the remote.
It affects several API tests.
This commit fixes that error. Also, it contains minor fixes for
TestLoadUnload.py for testing on Windows host and Linux target.
139df36d89