stats/kernel_selftests: remove sigaltstack_stat() for rencently kernel

Previously, sigaltstack have not been enabled, so we need special logic to
handle it. But rencently, this case is enabled, so we can remove this logic

fix the following sigaltstack duplication
------------
lizhijian@inn:/result/kernel_selftests/defaults/lkp-hsw-ep4/debian-x86_64-2016-08-31.cgz/x86_64-rhel-7.2/gcc-6/c0bc126f97fb929b3ae02c1c62322645d70eb408/5$
grep -A 2 sigaltstack
/result/kernel_selftests/defaults/lkp-hsw-ep4/debian-x86_64-2016-08-31.cgz/x86_64-rhel-7.2/gcc-6/c0bc126f97fb929b3ae02c1c62322645d70eb408/5/kernel_selftests.json
  "kernel_selftests.sigaltstack./usr/src/linux-selftests-x86_64-rhel-7.2-c0bc126f97fb929b3ae02c1c62322645d70eb408/tools/testing/selftests/sigaltstack/sas.pass":
[
    1
  ],
  "kernel_selftests.sigaltstack.sas.pass": [
    1
  ],
------------

Signed-off-by: Li Zhijian <[email protected]>
Signed-off-by: Philip Li <[email protected]>

stats/kernel_selftests

@@ -63,21 +63,6 @@ def x86_stat(line, _x86, stats)
   end
 end
 
-def sigaltstack_stat(line, sigaltstack, stats)
-  case line
-  when /gcc -Wall .+ -o (.+)/
-    sigaltstack['subtest'] = $1
-  when /^(\[FAIL\]|mmap)/
-    stats << "sigaltstack.#{sigaltstack['subtest']}.fail: 1"
-    sigaltstack['subtest'] = nil
-  when /Test passed/
-    stats << "sigaltstack.#{sigaltstack['subtest']}.pass: 1"
-    sigaltstack['subtest'] = nil
-  when %r{make: Leaving directory .*/(.*)'}
-    stats << "sigaltstack.#{sigaltstack['subtest']}.skip: 1" if sigaltstack['subtest']
-  end
-end
-
 while (line = STDIN.gets)
   line = line.remediate_invalid_byte_sequence(replace: '_') unless line.valid_encoding?
 
@@ -89,8 +74,6 @@ while (line = STDIN.gets)
       memory_hotplug_stat(line, tests_stats['memory-hotplug'], stats)
     elsif testname == 'mount'
       mount_stat(line, tests_stats['mount'], stats)
-    elsif testname == 'sigaltstack'
-      sigaltstack_stat(line, tests_stats['sigaltstack'], stats)
     else
       # rli9 FIXME: consider the input has messed text like Entering doesn't match with Leaving
       testname = nil
@@ -124,8 +107,6 @@ while (line = STDIN.gets)
       mount_stat(line, tests_stats['mount'], stats)
     elsif testname == 'x86'
       x86_stat(line, tests_stats['x86'], stats)
-    elsif testname == 'sigaltstack'
-      sigaltstack_stat(line, tests_stats['sigaltstack'], stats)
     end
   end
 end