* gdb.base/sigbpt.exp: Disable if gdb,nosignals.

	* gdb.base/sigbpt.exp: Disable if gdb,nosignals.
	* gdb.base/signull.exp: Disable if gdb,nosignals.
	* gdb.cp/bs15503.exp: Disable if skip_cplus_tests
	* gdb.cp/exception.exp: Disable if skip_cplus_tests.
	* gdb.mi/mi-console.exp: Disable hello test if gdb,noinferiorio.
	* gdb.mi/mi2-console.exp: Likewise.
	* gdb.trace/collection.exp (run_trace_experiment): Consume the
	continue output at start.
	(gdb_collect_locals_test): Robustify regexp.
	* gdb.trace/passc-dyn.exp: Fix comment typo.
	* gdb.trace/tfind.exp: Don't enable optimization. Remove stray ']'.