Fix test names starting with uppercase using multi-line gdb_test_no_output

Fix test names starting with uppercase using multi-line gdb_test_no_output

This fixes offender testcases that have test names starting with uppercase
when using gdb_test_no_output in a multi-line construct.

gdb/testsuite/ChangeLog
2016-12-01  Luis Machado  <lgustavo@codesourcery.com>

	Fix test names starting with uppercase throughout the files.

	* gdb.ada/assign_1.exp
	* gdb.ada/boolean_expr.exp
	* gdb.base/arrayidx.exp
	* gdb.base/del.exp
	* gdb.base/gcore-buffer-overflow.exp
	* gdb.base/testenv.exp
	* gdb.compile/compile.exp
	* gdb.python/py-framefilter-invalidarg.exp
	* gdb.python/py-framefilter.exp