gnu: qtsensors: Lengthen test timeout.

* gnu/packages/qt.scm (qtsensors)[arguments]: Lengthen test
timeout so it passes on slower machines.

gnu: Remove unnecessary module import.

This is a followup to d2885c83929b66a0cf98e740372bddb7e8787631.

* gnu/packages/version-control.scm: Remove needless module import.

daemon: Set TCP_NODELAY and TCP_QUICKACK on remote sockets.

* nix/nix-daemon/nix-daemon.cc (acceptConnection): Set TCP_NODELAY and
TCP_QUICKACK on REMOTE.

daemon: '--listen' can be passed several times, can specify TCP endpoints.

* nix/nix-daemon/guix-daemon.cc (DEFAULT_GUIX_PORT): New macro.
(listen_options): New variable.
(parse_opt): Push back '--listen' options to LISTEN_OPTIONS.
(open_unix_domain_socket, open_inet_socket)
(listening_sockets): New functions.
(main): Use it.  Pass SOCKETS to 'run'.
* nix/nix-daemon/nix-daemon.cc (matchUser): Remove.
(SD_LISTEN_FDS_START): Remove.
(acceptConnection): New function.
(daemonLoop): Rewrite to take a vector of file descriptors, to select(2)
on them, and to call 'acceptConnection'.
(run): Change to take a vector of file descriptors.
* tests/guix-daemon.sh: Add test.

store: Define a default port for TCP connections.

* guix/store.scm (%default-guix-port): New variable.
(connect-to-daemon)[connect]: Use it when (uri-port uri) is #f.
* doc/guix.texi (The Store): Mention the default port number.

store: Pass a socket type hint to 'getaddrinfo'.

* guix/store.scm (open-inet-socket): Pass hints in the 'getaddrinfo'
call.

gnu: webkitgtk: Update to 2.16.4 [fixes CVE-2017-2538].

* gnu/packages/webkit.scm (webkitgtk): Update to 2.16.4.

gnu: python-drmaa: Update source URL.

* gnu/packages/python.scm (python-drmaa)[source]: Use pypi-uri.

gnu: mbedtls-apache: Update to 2.5.1.

* gnu/packages/tls.scm (mbedtls-apache): Update to 2.5.1.

gnu: openvpn: Update to 2.4.3 [fixes CVE-2017-{7508,7512,7520,7521,7522}].

See 'Changes.rst' in the source distribution for more information about the
security-related changes.

* gnu/packages/vpn.scm (openvpn): Update to 2.4.3.

gnu: Update calibre to 3.0.0.

* gnu/local.mk: Remove patch.
* gnu/packages/ebook.scm (calibre): Update to 3.0.0.
* gnu/packages/patches/calibre-dont-load-remote-icons.patch: Remove file.

gnu: propeller-gcc: Default to version 4.

* gnu/packages/embedded.scm (propeller-gcc): Rename this...
(propeller-gcc-6): ...to this.
(propeller-gcc-4): Inherit from propeller-gcc-6.
(propeller-gcc): New alias for propeller-gcc-4.

gnu: knot: Update to 2.5.1.

* gnu/packages/dns.scm (knot): Update to 2.5.1.
[inputs]: Add python-2 and python2-lmdb.
[arguments]: Adapt #:configure-flags.  Add ‘wrap-python-scripts’ phase.

gnu: Add python-lmdb.

* gnu/packages/databases.scm (python-lmdb, python2-lmdb): New variables.

gnu: lmdb: Expand description.

* gnu/packages/databases.scm (lmdb)[synopsis]: Capitalise.
[description]: Elaborate.

gnu: python-pycodestyle: Update to 2.3.1.

* gnu/packages/python.scm (python-pycodestyle): Update to 2.3.1.

gnu: cracklib: Fix up description.

* gnu/packages/password-utils.scm (cracklib)[description]: Fix typos, add
mark-up, and drop unclear reference to the ancient ‘Crack 5’ tool.

gnu: libpwquality: Update to 1.4.0.

* gnu/packages/password-utils.scm (libpwquality): Update to 1.4.0.

gnu: Remove unused python-flake8-2.2.4.

* gnu/packages/python.scm (python-flake8-2.2.4): Remove variable.

gnu: python-hacking: Update to 0.13.0.

* gnu/packages/openstack.scm (python-hacking): Update to 0.13.0.
[arguments]: Re-enable tests.
[propagated-inputs]: Use latest python-flake8.
[native-inputs]: Add python-eventlet, python-mock, python-reno, and
python-testrepository for tests.