percona_changed_page_bmp not runnable with release builds or Valgrind

[Laurynas Biveinis]

Testcase percona_changed_page_bmp contains the bulk of bitmap writer tests, but it's disabled under Valgrind. Testcase percona_changed_page_bmp_no_restart is not disabled under Valgrind, but contains only rudimentary tests.

This division is suboptimal: the only tests that should be disabled under Valgrind are the ones using injected crashes and very fast InnoDB shutdowns. The rest of tests should be runnable under Valgrind. The name "_no_restart" is misleading as well then.