Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 664ce36e4606ba855bb997059f43d89bb51385e5
  - k8s: Change default cluster access method choice logic

    Previous way of choosing it led to impractical calls, e.g.

    $ ./check -rke                   # (works fine)
    $ ./check -ranchercli            # "Not supported."
    $ ./check -ranchercli -rke=false # (works fine)

    Disabling default cluster access method is no longer necessary.

    Issue-ID: SECCOM-235
    Change-Id: I2b4d5bff10c5470e567351abeac0431bed3b7938
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>