Merge pull request #16733 from Rajpratik71:master

Some debian package manager tweaks

modules/videoio/misc/plugin_ffmpeg/Dockerfile-ffmpeg

 FROM ubuntu:18.04
 
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && apt-get --no-install-recommends install -y \
         pkg-config \
         cmake \
         g++ \

modules/videoio/misc/plugin_ffmpeg/Dockerfile-ubuntu

 ARG VER
 FROM ubuntu:$VER
 
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && apt-get --no-install-recommends install -y \
         libavcodec-dev \
         libavfilter-dev \
         libavformat-dev \

modules/videoio/misc/plugin_gstreamer/Dockerfile

 FROM ubuntu:18.04
 
-RUN apt-get update && apt-get install -y \
+RUN apt-get update && apt-get --no-install-recommends install -y \
         libgstreamer-plugins-base1.0-dev \
         libgstreamer-plugins-good1.0-dev \
         libgstreamer1.0-dev \