Include system information into log output

When checking logs on testnode, it is very useful to know which kernel
version is running inside (wendelin.core uses FUSE and depends on having
patched FUSE module for kernels < 5.2), which CPU is there, etc.

Format of printed output follows go benchmarking format and coincides
with start of `neotest info-local` (see footers on figures in
http://navytux.spb.ru/~kirr/neo.html and here:
https://lab.nexedi.com/kirr/neo/blob/1f26678b/go/neo/t/neotest#L585-874)

nxdtest

@@ -57,8 +57,8 @@ from __future__ import print_function, absolute_import
 
 from erp5.util.taskdistribution import TaskDistributor
 from subprocess import Popen, PIPE
-from time import time, strftime, gmtime
-import os, sys, threading, argparse, logging, traceback, re
+from time import time, strftime, gmtime, localtime
+import os, sys, threading, argparse, logging, traceback, re, pwd, socket
 import six
 
 # loadNXDTestFile loads .nxdtest file located @path.
@@ -161,6 +161,9 @@ def main():
     # tell python not to buffer anything.
     os.environ['PYTHONUNBUFFERED'] = 'y'
 
+    # log information about local node
+    system_info()
+
     # run the tests
     devnull = open(os.devnull)
     while 1:
@@ -291,6 +294,29 @@ def test_result_summary(name, kw):
     return '%s\t%s\t%.3fs\t# %st %se %sf %ss' % (st, name, kw['duration'], v('test_count'), v('error_count'), v('failure_count'), v('skip_count'))
 
 
+# system_info prints information about local computer.
+def system_info():
+    print('date:\t%s' % (strftime("%a, %d %b %Y %H:%M:%S %Z", localtime())))
+    whoami = pwd.getpwuid(os.getuid()).pw_name
+    print('xnode:\t%s@%s' % (whoami, socket.getfqdn()))
+    print('uname:\t%s' % ' '.join(os.uname()))
+    print('cpu:\t%s' % get1('/proc/cpuinfo', 'model name'))
+
+# get1 returns first entry from file @path prefixed with ^<field>\s*:
+def get1(path, field, default=None):
+    with open(path, 'r') as f:
+        data = f.read()
+    rex = re.compile(r'^%s\s*:\s*(.*)$' % field)
+    for l in data.splitlines():
+        m = rex.match(l)
+        if m is not None:
+            return m.group(1)
+    if default is not None:
+        return default
+    raise KeyError('%s does not have field %r' % (path, field))
+
+
+
 # LocalTestResult* handle tests runs, when master_url was not provided and tests are run locally.
 class LocalTestResult:
     def __init__(self, tenv, run=None):