Move debian scripts to debian package directory

Change-Id: I15027dcf8cb2659e657f8fdae123a81c2c1e44bb
Install README.md into docs file in a standard way

Change-Id: If3fc79909ba90ca4e815c2fcdfaa52bc5fa55e7d
Update plugins sumodule

  valgrind: Add suppresion for gst_static_pad_template_get
  agnosticbin: Fix memory leak
  agnosticbin: Add constant for setting object data
  agnosticbin: Block tee sink pad before connecting new src elements
  agnosticbin: Do not block input data while negotiating
  agnosticbin: Drop reconfigure events on tees
  agnosticbin: Links sink elements and then link sources
  Increase tests timeout to avoid problems with slow CPU's
  kmswebrtcendpoint: check ICE candidates before use them
  kmswebrtcendpoint: check local and remote ssrcs mapping for connection
  kmswebrtcendpoint: improve sdp_media_get_ssrc
  Update kms-dtls-plugins

Change-Id: I8bee1cb75a5093edcdfd8b00aabf9c5ea7ccfe6e