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box: check if iterator was created when loading WAL GC consumers

We load WAL GC consumers right after recovery - it is done by iterating
over space `_gc_consumers`. However, we forgot to check if the iterator
is successfully created, hence, in the case of OOM right after recovery,
Tarantool will crash because iterator is NULL. The commit adds the
check. Along the way, let's log an explanatory message when we fail to
load consumers to make the problem clear. Also, this message will allow
us to write a more stable test.

Closes tarantool/security#135

NO_CHANGELOG=barely reproducible by user
NO_DOC=bugfix

(cherry picked from commit 6c7827a0b)

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