usertools/devbind: conform to PEP8 recommended style
usertools/devbind: conform to PEP8 recommended style

This fixes most of the warnings from the Flake8 style checker.
The ones remaining are long lines (we allow > 79 characters)
and a line break warning.  The line break style changed in later
versions of PEP 8 and the tool is not updated.

https://www.flake8rules.com/rules/W503.html

Signed-off-by: Stephen Hemminger <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@networkplumber.org>
Acked-by: Anatoly Burakov <814e00d8f6e4e81b7ccc7e3e5a0bfec0078f0203@intel.com>
Acked-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>
Tested-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk