replace attach/detach functions

The functions for EAL attach/detach had already some replacements, so they are removed.
The functions for ethdev attach/detach are removed and replaced thanks to a new ethdev iterator working with devargs.

rte_eth_dev_attach(devargs, &port_id)
is replaced by:

    rte_dev_probe(devargs);
    RTE_ETH_FOREACH_MATCHING_DEV(port_id, devargs, &iterator) {
        do what you want with the new port_id
    }

The biggest benefit is to be able to manage devargs string matching several ports to probe.

Changes in v7:
- remove use of eth_dev->data->name after detach in testpmd

Changes in v6:
- improve testpmd logs
- update testpmd port_status when detaching multiple ports

Changes in v5:
- check double detach in testpmd

Changes in v4:
- fix compilation (due to stricter checks in v3)

Changes in v3 - after Andrew's review:
- coding rules compliance
- stricter checks for snprintf
- rte_eth_iterator_free() becomes rte_eth_iterator_cleanup()
- add rte_eth_iterator_cleanup in .map

Changes in v2 - after Andrew's review:
- return only 0 or -1 in vdev_dev_match()
- fix freeing of strings in the iterator
- add rte_eth_iterator_free()
- tolerate extra parameters from old syntax
- add more comments
- separate contributing guide patch

Thomas Monjalon (7):
bus/vdev: add iteration filter on name
ethdev: add iterator to match devargs input
ethdev: allow iterating with pure class filter
doc: replace doxygen example in contribution guide
ethdev: remove deprecated attach/detach functions
eal: remove deprecated attach/detach functions app/testpmd: check not detaching device twice

 app/test-pmd/testpmd.c                        |  42 +++-
 doc/guides/contributing/documentation.rst     |  15 +-
 doc/guides/prog_guide/index.rst               |   1 -
 .../prog_guide/port_hotplug_framework.rst     | 106 ---------
 doc/guides/rel_notes/deprecation.rst          |  12 -
 doc/guides/rel_notes/release_18_11.rst        |  12 +
 drivers/bus/vdev/vdev_params.c                |  19 +-
 drivers/net/virtio/virtio_user_ethdev.c       |   1 -
 lib/librte_eal/common/eal_common_dev.c        |  53 -----
 lib/librte_eal/common/include/rte_common.h    |   6 +
 lib/librte_eal/common/include/rte_dev.h       |  27 ---
 lib/librte_eal/rte_eal_version.map            |   2 -
 lib/librte_ethdev/ethdev_private.c            |  10 +-
 lib/librte_ethdev/ethdev_private.h            |   6 +
 lib/librte_ethdev/rte_class_eth.c             |   9 +-
 lib/librte_ethdev/rte_ethdev.c                | 223 +++++++++++-------
 lib/librte_ethdev/rte_ethdev.h                | 110 ++++++---
 lib/librte_ethdev/rte_ethdev_version.map      |   5 +-
 18 files changed, 321 insertions(+), 338 deletions(-)
 delete mode 100644 doc/guides/prog_guide/port_hotplug_framework.rst

2.19.0