Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "Qemu: Mechanism to pass extra qemu cpu features and pin vCPU threads"
  - Qemu: Mechanism to pass extra qemu cpu features and pin vCPU threads

    JIRA: VSPERF-510

    This patch is used to implement the mechanism to pass extra qemu
    cpu options required to achieve better results/performance. Also
    used to implement a mechanism to pin the vCPU threads to another
    pCPU core which helps in reducing the noise from housekeeping
    thread and packet loss.

    Change-Id: Ic40fd47d7c4f5556f7e240c6ca671a0535d06ece
    Signed-off-by: Gundarapu Kalyan Reddy <reddyx.gundarapu@intel.com>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index 8d528f2..862ef28 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit 8d528f2b4c66d94ea8760053f9bc75c595630056
+Subproject commit 862ef28b808aca4dd75cc44a83023362dcce1969