* gdb.mi/mi-basics.exp: Tell mi_gdb_start to use a PTY for inferior.
(test_setshow_inferior_tty): Add global mi_inferior_tty_name to scope.
Change tests to inferior-tty-set/show.
* gdb.mi/mi-console.exp: Tell mi_gdb_start to use a PTY for inferior.
(47-exec-next): Use mi_gdb_test to get GDB and Inferior output.
* gdb.mi/mi-syn-frame.exp: Tell mi_gdb_start to use a PTY for
inferior. Use mi_gdb_test to get GDB and Inferior output.
* lib/mi-support.exp (mi_inferior_spawn_id): Add inferior PTY
descriptor.
(mi_inferior_tty_name): Add inferior PTY file name.
(mi_gdb_start): Add INFERIOR_PTY parameter.
(mi_gdb_test): Add IPATTERN parameter.
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