ebtables-save: Fix counter formatting

The initial problem was 'ebtables-save -c' printing iptables-style
counters but at the same time not disabling ebtables-style counter
output (which was even printed in wrong format for ebtables-save).

The code around counter output was complicated enough to motivate a
larger rework:

* Make FMT_C_COUNTS indicate the appended counter style for ebtables.

* Use FMT_EBT_SAVE to distinguish between '-c' style counters and the
  legacy pcnt/bcnt ones.

Consequently, ebtables-save sets format to:

FMT_NOCOUNTS			- for no counters
FMT_EBT_SAVE			- for iptables-style counters
FMT_EBT_SAVE | FMT_C_COUNTS	- for '-c' style counters

For regular ebtables, list_rules() always sets FMT_C_COUNTS
(iptables-style counters are never used there) and FMT_NOCOUNTS if no
counters are requested.

The big plus is if neither FMT_NOCOUNTS nor FMT_C_COUNTS is set,
iptables-style counters are to be printed - both in iptables and
ebtables. This allows to drop the ebtables-specific 'save_counters'
callback.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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