Bug 1518762 - Avoid error in psutil.disk_io_counters in resourcemonit…

…or r=ahal

Imports giampaolo/psutil@8f99f37
to fix a bug with Linux kernel 4.18+, giampaolo/psutil#1354
(to be included in a future release of psutil, version 5.5.0)

Differential Revision: https://phabricator.services.mozilla.com/D16028

UltraBlame original commit: e26eda77b71c6c02db69441236dd95fc0db5c7f2

third_party/python/psutil/psutil/_pslinux.py

@@ -1054,6 +1054,8 @@ def get_partitions():
 
 
 
+
+
         fields = line.split()
         fields_len = len(fields)
         if fields_len == 15:
@@ -1062,7 +1064,7 @@ def get_partitions():
             reads = int(fields[2])
             (reads_merged, rbytes, rtime, writes, writes_merged,
                 wbytes, wtime, _, busy_time, _) = map(int, fields[4:14])
-        elif fields_len == 14:
+        elif fields_len == 14 or fields_len == 18:
 
             name = fields[2]
             (reads, reads_merged, rbytes, rtime, writes, writes_merged,