Update .gitlab-ci.yaml to install IM and osmclient requirements

With the standardization of pip in all modules, the dependencies
of IM and osmclient are stored in requirements.txt and must be
installed from that file.
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

.gitlab-ci.yml

@@ -10,8 +10,10 @@ publish-repository:
     - git submodule update
     - python3 -m pip install wheel pyang pyangbind
     - git clone https://osm.etsi.org/gerrit/osm/IM.git
+    - pip3 install -r IM/requirements.txt
     - pip3 install IM/
     - git clone https://osm.etsi.org/gerrit/osm/osmclient.git
+    - pip3 install -r osmclient/requirements.txt
     - pip3 install osmclient/
     - rm -rf osmclient/ IM/
     - mv magma/* .
@@ -38,8 +40,10 @@ build-local-repository:
     - git submodule update
     - python3 -m pip install wheel pyang pyangbind
     - git clone https://osm.etsi.org/gerrit/osm/IM.git
+    - pip3 install -r IM/requirements.txt
     - pip3 install IM/
     - git clone https://osm.etsi.org/gerrit/osm/osmclient.git
+    - pip3 install -r osmclient/requirements.txt
     - pip3 install osmclient/
     - rm -rf osmclient/ IM/
     - mv magma/* .