Random failure to parse JSON when retrieving package

Sometimes the package retrieval checksum verification fails because the JSON answer from connect is not parsed correctly:

../../libs/nuxeoServer.sh: line 215: [: "resultsCount":1: integer expression expected

This can be reproduced by launching ./nuxeoServer_test.sh in a row.

The JSON response does not contain a fixed attribute order. This means, the resultCount attribute can be either at the beginning or in the middle having a trailing comma, or be at the end and have no comma at all.

The following regex

sed 's/.*:\([0-9]*\),$/\1/g'

is the culprit.

To fix this, the countExistingPackages from connect lib should be used. It has a more reliable parsing and handles all those use cases.