gtestutils: Style touchup

Use more modern styling to the code added in the previous patch:
- split 'label: stmt; stmt;' into multiple lines
- add default: label with g_assert_not_reached() [yes, it's a bit
  weird adding an assertion inside code that handles assertions, but
  we should be okay since g_assertion_message_* are not public
  functions and should only be used by our macros]
- use <inttypes.h> for shorter format strings

Note, however, that using uint64_t in gtestutils.h is not feasible,
since it would require adding an '#include <stdint.h>' with potential
unintended namespace pollution to older clients.

Signed-off-by: Eric Blake <eblake@redhat.com>

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