tests, bridge: add tests for interface protection

The original author of the test is k-goda@IIJ. ozaki-r improved
the test slightly.

branches: 1.3.22; 1.3.24;
Separate tests for learning table of bridge

branches: 1.2.2;
Move get_macaddr to net_common.sh

branches: 1.1.2;
Add net/if_bridge test

branches: 1.1.2; 1.1.6;
tests, bridge: add tests for interface protection

The original author of the test is k-goda@IIJ. ozaki-r improved
the test slightly.

tests, bridge: add tests for interface protection

The original author of the test is k-goda@IIJ. ozaki-r improved
the test slightly.

tests: dedup test scripts like others

branches: 1.19.8; 1.19.10;
tests: use rump_server_add_iface to create interfaces

branches: 1.18.4;
Commonalize and add tests of creating/destroying interfaces

branches: 1.17.4;
Separate tests for learning table of bridge

branches: 1.16.2;
Share rump_server start/stop and interface creation/destruction functions

The common functions store socks of rump_servers, interfaces of rump_servers
and buses that intefaces connect and allow to destroy them with common
functions without specifying which socks, interfaces and buses we should
destroy.

This change reduces lots of similar setup/cleanup codes.

Add $DEBUG and remove a unused function

Move get_macaddr to net_common.sh

+ -lrumpdev (and avoid doing stuff twice).

branches: 1.12.2;
Make a bunch of test names self-descriptive

Use rump.ping6 instead of ping6 with rumphijack(3)

Reflect a fix for bridge

Due to PR 48104, some tests of ping/ping6 were failed but the tests now
should be successful. So reverse atf_check.

Bonus: the fix for PR 48104 also fixes another uknown failure.

Add missing cleanup

Add tests for bridge members with an IP address

The tests include checks for PR#48104 which is not fixed yet.

Note that one test unexpectedly fails for some reason
(unrelated to PR#48104). We have to fix it somehow.

Disable test_ping_failure which is conducted before setup_bridge

It randomly fails (esp, often on a slow or loaded machine) due to
PR kern/49219, so disable it for now.

I forgot why I didn't include the test when I committed the test
at first and wrongly added it at v1.4.

Bump timeout for ping and ping6 to 5 sec

Hope the wait is enough for slow machines, e.g., qemu/anita/i386.

Get rid of unnecessary shebang

It will be added when it's built.

Enable IPv6 negative tests

As ping6 timeout feature (-X option) is added, we can do negative
tests without wasting time.

1 sec delay is added after network setup to avoid false positives.

Add tests for brconfig maxaddr

Add some tests for rtable operations of if_bridge

Add net/if_bridge test

fix various typos in documentation, comments and sysctl device description.
mainly aion -> ation and inlude -> include.

tests: use rump_server_add_iface to create interfaces

tests: check that a new cache is not created over the limit

Increase the timeout for the manyaddrs test case; the default is often
insufficient under qemu.

Add a test to show a large number of MAC addresses cached in a bridge

branches: 1.3.2;
Add a test that checks if brconfig flush surely removes all entries

Add a test case for bridge_rtdelete

branches: 1.1.2; 1.1.4; 1.1.8; 1.1.14;
Separate tests for learning table of bridge

branches: 1.1.2; 1.1.6;
tests, bridge: add tests for interface protection

The original author of the test is k-goda@IIJ. ozaki-r improved
the test slightly.