Update git submodules

Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 3a3d8e4ff51b849335946ec1cc06aedaa133730b
  - Test coverage in rest-healthcheck-adapter

    Increased coverage

    Issue-ID: APPC-1387
    Change-Id: Idafa0d7dbd5cb740728197bc3b4c232bdbef0821
    Signed-off-by: Joss Armstrong <joss.armstrong@ericsson.com>
  - Improve test coverage of reboot

    Increase line coverage from 20% to 73%

    Issue-ID: APPC-1374
    Change-Id: I219261a228f42df56f6988b2d5dc157e6fb10c42
    Signed-off-by: Joss Armstrong <joss.armstrong@ericsson.com>
  - Increase coverage of EvacuateServer

    Increased line coverage of class

    Issue-ID: APPC-1374
    Change-Id: Ica44ff92a446e8b380162675d0f0f79e30ad6e73
    Signed-off-by: Joss Armstrong <joss.armstrong@ericsson.com>
  - Add coverage for seqgen-provider

    Added coverage for untested package

    Issue-ID: APPC-1386
    Change-Id: I6b6d74c54982dd327176a2e1e5f3c873be9dbb89
    Signed-off-by: Joss Armstrong <joss.armstrong@ericsson.com>