Add missing openssh-client dependency

Signed-off-by: Marco Marinello <mmarinello@sezf.it>

.gitlab-ci.yml

+variables:
+  GIT_DEPTH: 1
+
 # Is performed before the scripts in the stages step
 before_script:
   - source /etc/profile
@@ -12,7 +15,7 @@ build-jessie:
   stage: test
   script:
     - apt-get update -qy
-    - apt-get install -y build-essential debhelper libncurses5-dev libglib2.0-dev libgeoip-dev libtokyocabinet-dev zlib1g-dev libncursesw5-dev libbz2-dev unzip wget squashfs-tools
+    - apt-get install -y build-essential debhelper libncurses5-dev libglib2.0-dev libgeoip-dev libtokyocabinet-dev zlib1g-dev libncursesw5-dev libbz2-dev unzip wget squashfs-tools openssh-client
     - make rebuild-squashfs
 
   # The files which are to be made available in GitLab