log level control enhancements

This patch set improves the log-level option in EAL. It adds symbolic names for log levels (error, info, debug, etc) and shell style matching of log levels.
--log-level='pmd.ixgbe.*:debug'

The original syntax (which is maintained for compatibility) used numeric values, comma as separator and regular expression to match log level.

It was often documented as:
--log-level='pmd.ixgbe.*,8' ...
but this only worked by accident. The period was really a regular expression match any character (not match a period); and the asterisk in regular expression is match repeated value.

v3
- rename internal function rte_eal_log_save_XXX to rte_log_save_XXX
- fixup typos in coding style doc

v2
- make facility table constant
- rebase to include support for dynamic log late binding
- add patch to make saving log level a private API
- update driver docs

Stephen Hemminger (5):
eal: make syslog facility table const
eal: allow symbolic log levels
eal: make eal_log_level save private
log: add ability to match dynamic log based on shell pattern
doc: update guides for current preferrred log level syntax

 doc/guides/contributing/coding_style.rst   |   4 +-
 doc/guides/cryptodevs/dpaa2_sec.rst        |   2 +-
 doc/guides/cryptodevs/dpaa_sec.rst         |   2 +-
 doc/guides/faq/faq.rst                     |  23 ++---
 doc/guides/nics/dpaa2.rst                  |   4 +-
 doc/guides/nics/qede.rst                   |   2 +-
 doc/guides/nics/sfc_efx.rst                |  12 +--
 doc/guides/nics/tap.rst                    |   2 +-
 lib/librte_eal/common/eal_common_log.c     | 103 ++++++++++++++++---
 lib/librte_eal/common/eal_common_options.c | 113 +++++++++++++--------
 lib/librte_eal/common/eal_private.h        |   6 ++
 lib/librte_eal/common/include/rte_log.h    |  44 +++-----
 lib/librte_eal/rte_eal_version.map         |   7 ++
 13 files changed, 211 insertions(+), 113 deletions(-)

2.17.0