title: Travis error repository not Could not read from remote repository
body: <p>My folder structure is as below
      rserver-docker contains gitsubmodule of rserver</p>
  
  <p>git submodule(rserver-docker) is as below:</p>
  
  <pre><code>[submodule "rserver"]   
  path = rserver  
  url = git@github.com:VInc/rserver.git
  </code></pre>
  
  <p>Travis looks as below</p>
  
  <pre><code>before_install:
    - echo $CI_USER_TOKEN
    - echo -e "\n\nmachine github.com\n login $CI_USER_TOKEN\n" &gt;&gt;~/.netrc
    - git submodule update --init --recursive
  </code></pre>
  
  <p>CI_USER_TOKEN is Personal access token updated in Travis-settings</p>
  
  <p>I am getting error as below</p>
  
  <pre><code> $ git clone --depth=50 --branch=dev git@github.com:VInc/rserver-docker.git VInc/rserver-docker
  Cloning into 'VInc/rserver-docker'...
  Warning: Permanently added the RSA host key for IP address '192.30.253.112' to the list of known hosts.
  $ cd VInc/rserver-docker
  $ git checkout -qf d445f5afe71a6f3390345842644e600ee4bbb68b
  7.47s$ git submodule update --init --recursive
  Submodule 'rserver' (git@github.com:VInc/rserver.git) registered for path 'rserver'
  Cloning into '/home/travis/build/VInc/rserver-docker/rserver'...
  ERROR: Repository not found.
  fatal: Could not read from remote repository.
  Please make sure you have the correct access rights
  and the repository exists.
  fatal: clone of 'git@github.com:VInc/rserver.git' into submodule path '/home/travis/build/VInc/rserver-docker/rserver' failed
  Failed to clone 'rserver'. Retry scheduled
  Cloning into '/home/travis/build/VInc/rserver-docker/rserver'...
  ERROR: Repository not found.
  </code></pre>