Log Message:
Update py-psutil to 4.1.0

4.1.0 - 2016-03-12
==================

**Enhancements**

- #777: [Linux] Process.open_files() on Linux return 3 new fields: position,
  mode and flags.
- #779: Process.cpu_times() returns two new fields, 'children_user' and
  'children_system' (always set to 0 on OSX and Windows).
- #789: [Windows] psutil.cpu_times() return two new fields: "interrupt" and
  "dpc". Same for psutil.cpu_times_percent().
- #792: new psutil.cpu_stats() function returning number of CPU ctx switches
  interrupts, soft interrupts and syscalls.

**Bug fixes**

- #774: [FreeBSD] net_io_counters() dropout is no longer set to 0 if the kernel
  provides it.
- #776: [Linux] Process.cpu_affinity() may erroneously raise NoSuchProcess.
  (patch by wxwright)
- #780: [OSX] psutil does not compile with some gcc versions.
- #786: net_if_addrs() may report incomplete MAC addresses.
- #788: [NetBSD] virtual_memory()'s buffers and shared values were set to 0.
- #790: [OSX] psutil won't compile on OSX 10.4.

4.0.0 - 2016-02-17
==================

**Enhancements**

- #523: [Linux, FreeBSD] disk_io_counters() return a new "busy_time" field.
- #660: [Windows] make.bat is smarter in finding alternative VS install
  locations.  (patch by mpderbec)
- #732: Process.environ().  (patch by Frank Benkstein)
- #753: [Linux, OSX, Windows] Process USS and PSS (Linux) "real" \ 
memory stats.
  (patch by Eric Rahm)
- #755: Process.memory_percent() "memtype" parameter.
- #758: tests now live in psutil namespace.
- #760: expose OS constants (psutil.LINUX, psutil.OSX, etc.)
- #756: [Linux] disk_io_counters() return 2 new fields: read_merged_count and
  write_merged_count.
- #762: new scripts/procsmem.py script.

**Bug fixes**

- #685: [Linux] virtual_memory() provides wrong results on systems with a lot
  of physical memory.
- #704: [Solaris] psutil does not compile on Solaris sparc.
- #734: on Python 3 invalid UTF-8 data is not correctly handled for process
  name(), cwd(), exe(), cmdline() and open_files() methods resulting in
  UnicodeDecodeError exceptions. 'surrogateescape' error handler is now
  used as a workaround for replacing the corrupted data.
- #737: [Windows] when the bitness of psutil and the target process was
  different cmdline() and cwd() could return a wrong result or incorrectly
  report an AccessDenied error.
- #741: [OpenBSD] psutil does not compile on mips64.
- #751: [Linux] fixed call to Py_DECREF on possible Null object.
- #754: [Linux] cmdline() can be wrong in case of zombie process.
- #759: [Linux] Process.memory_maps() may return paths ending with " \ 
(deleted)"
- #761: [Windows] psutil.boot_time() wraps to 0 after 49 days.
- #764: [NetBSD] fix compilation on NetBSD-6.x.
- #766: [Linux] net_connections() can't handle malformed /proc/net/unix file.
- #767: [Linux] disk_io_counters() may raise ValueError on 2.6 kernels and it's
  broken on 2.4 kernels.
- #770: [NetBSD] disk_io_counters() metrics didn't update.