Send deleted watchpoint-scope output to all UIs

Testing with:

  make check RUNTESTFLAGS="SEPARATE_MI_TTY=1"

shows this, in gdb.mi/mi-watch.exp:

 -*stopped,reason="watchpoint-scope",wpnum="2",frame={addr="0x00000000004005cb",
 +*stopped,frame={addr="0x00000000004005cb",
 (...)
 -PASS: gdb.mi/mi-watch.exp: hw: watchpoint trigger
 +FAIL: gdb.mi/mi-watch.exp: hw: watchpoint trigger (unknown output after running)

That is, we lose the "watchpoint-scope" output on the MI UI.

This commit fixes it, and makes the test run with MI running as both
main UI and separate UI.

gdb/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (watchpoint_check): Send watchpoint-deleted output
	to all UIs.

gdb/testsuite/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* gdb.mi/mi-watch.exp (test_watchpoint_creation_and_listing)
	(test_awatch_creation_and_listing)
	(test_rwatch_creation_and_listing, test_watchpoint_triggering):
	Remove 'type' parameter.
	(test_watchpoint_all): New parameter mi_mode.  Remove
	with_test_prefix.
	(top level): Use foreach_with_prefix, and add main/separate UI MI
	testing axis.

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