osd: EC optimizations overaggresive check for missing objects

osd: EC optimizations overaggresive check for missing objects

Relax an assert in read_log_and_missing for optimized EC
pools. Because the log may not have entries for partial
writes but the missing list is calculated from the full
log the need version for a missing item may be newer than
the lastest log entry for that object.

ceph_objectstore_tool needs care because we don't want to add
extra dependencies. To minimise the dependencies, we always
relax the asserts when using this tool.

Signed-off-by: Bill Scales <bill_scales@uk.ibm.com>
Signed-off-by: Alex Ainscow <aainscow@uk.ibm.com>