LP:632971 - maria_read_log fails to create MAI files

In certain instances maria_read_log -a fails to create any MAI files but still reports success.

Examination with strace reveals the following calls:

open("/tmp/test/table100000_maria_key_pk_parts_2_int_autoinc#P#p0.MAI", O_RDWR) = -1 ENOENT (No such file or directory)
open("/tmp/test/table100000_maria_int_autoinc.MAI", O_RDWR) = -1 ENOENT (No such file or directory)
open("/tmp/test/table100000_maria_key_pk_parts_2_int_autoinc#P#p1.MAI", O_RDWR) = -1 ENOENT (No such file or directory)

It seems that this happens when the first part of the log is not available to maria_read_log because it was rotated out. In this case, -a should fail with a suitable error message rather than just do nothing. Errors from open() should be handled and reported.