snapd 2.25 ADT test failure with linux 4.4.0-87.110

[Andy Whitcroft]

There is a timeout while waiting for some download. An updated version of snapd (2.26.10) seems to have fixed the problem by modifying the waiting condition.

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Testing failed on:
    amd64: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/amd64/s/snapd/20170721_074926_c70b0@/log.gz
    i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/s/snapd/20170719_143929_bfaed@/log.gz
    ppc64el: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/ppc64el/s/snapd/20170719_125802_bfaed@/log.gz

[Kleber Sacilotto de Souza (kleber-souza)]

This issue is also reproducible with Zesty ADT tests with linux 4.10.0-29.33

    amd64: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-zesty/zesty/amd64/s/snapd/20170720_121820_bee5c@/log.gz
    i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-zesty/zesty/i386/s/snapd/20170720_124655_bee5c@/log.gz
    ppc64el: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-zesty/zesty/ppc64el/s/snapd/20170720_115946_bee5c@/log.gz