oeqa: qemu: fix width of top output in host dump

If runqemu fails, there is some logic to run a set of commands to dump
various bits of information that might help debug the issue
(particularly in a busy situation such as on the autobuilder). One of
those commands is "top -bn1", however top restricts the output to the
width of the calling terminal, and for whatever reason this is a little
restrictive when called from inside testimage, so set COLUMNS in the
environment to a high value to fix it. (Another way is to use the -w
option, but that is not supported by our default busybox configuration
so it will then fail when this same list of commands is used on the
target).

(From OE-Core rev: 07da998f5aa6c3f5ffeee5150fc579e8a1051ba4)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/dump.py

@@ -73,6 +73,7 @@ class HostDumper(BaseDumper):
             self.dump_dir = dump_dir
         env = os.environ.copy()
         env['PATH'] = '/usr/sbin:/sbin:/usr/bin:/bin'
+        env['COLUMNS'] = '9999'
         for cmd in self.cmds:
             result = runCmd(cmd, ignore_status=True, env=env)
             self._write_dump(cmd.split()[0], result.output)