remove write to disk/db from receiver config, will always write, introduced kStoreInDatabase ingest mode

The numpy version is chosen based on the numpy version provided by
debian and centos for python < 3.7 and the version used by scipy wheels
for all other python version.

Additionally, the producer
and the consumer now have the same setup and install dependencies on
cython.

Squashed commit of the following:

commit ce33557832515d541b9d2b505c53225885fd61c7
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Wed Feb 19 13:41:28 2020 +0100

    update producer side

commit 0bed6f6ecf3d83ca2f958b6574ad63664f1bfc8c
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Wed Feb 19 11:55:56 2020 +0100

    receiver sends warnings for duplicated requests

commit fedf16d3eec9f9a7a1582c8b9f1b8028815a31eb
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Wed Feb 19 11:29:18 2020 +0100

    db handler deals with duplicate record

commit d9d242e72b522b15a894c23732f261a584574cb5
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Wed Feb 19 10:31:11 2020 +0100

    fix memory error in tests

commit a6c382c2a13dd31520a4bf4561bab1c5ca7e9adf
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Tue Feb 18 17:40:48 2020 +0100

    fix mongodb bug

commit 79eaa0107c4550b36c9d3d82259a05c39508b7cc
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Tue Feb 18 16:47:01 2020 +0100

    refactor write/receive file handlers, check record in db

commit 20b4dc0533128ec192134d0ffc2899351d933e5b
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Mon Feb 17 16:39:49 2020 +0100

    add overwrite flag to IO routines

commit cf23ea3ca5387ed7c7d52726806bae0e3f6ff1d6
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Mon Feb 17 14:50:14 2020 +0100

    introduce timeout for producer

commit 943cf3c837f151708e538813cf8480bf82e50a53
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Fri Feb 14 13:47:39 2020 +0100

    implement GetById for c mongo client

commit 0153e0d1e662584b18c3f55a64093dd343176ac2
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Fri Feb 14 12:08:03 2020 +0100

    refactor

commit 631ca34a8be489ba3261a697d5ca889a666d78f2
Author: Sergey Yakubov <sergey.yakubov@desy.de>
Date:   Thu Feb 13 18:16:42 2020 +0100

    receiver request handler to check db