Fix - remotes iterators

[kuba--]

Test repos:

pga list -l ruby -f json | head -n 5 | jq -r '.sivaFilenames[]' | pga get -i -o repos
pga list -l python -f json | head -n 5 | jq -r '.sivaFilenames[]' | pga get -i -o repos
pga list -l javascript -f json | head -n 5 | jq -r '.sivaFilenames[]' | pga get -i -o repos

Test queries:

SELECT * FROM remotes WHERE remote_push_url REGEXP '^https://*';
SELECT * FROM remotes WHERE remote_push_url != 'trash';

CREATE INDEX uidx ON remotes USING pilosa (remote_push_url);

Both queries shall return 35 rows (based on test repos). After creating an index, the second query returns just 15 rows.

Note:
The issue can be related with indexes (then we'll have to transfer it to mysql) or just with remotes table iterator.