Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 9148cc289f479dd535844c819bdabcf80718305b
  - Add 'build' target for 'sslendpoints' project

    To follow a common protocol of testing Golang based
    applications in CI we need a 'build' target for doing
    a local (non-docker) build to verify 'go build' routine.

    It's however not added to "all" target as that one already
    references docker based build by default.

    Change-Id: I2e380ef09a1ae18456d7288f853d085617149338
    Issue-ID: SECCOM-261
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>