Pin libjuju versions to 2.8.4

Change-Id: I10afc20b8e4b5099cbf3867b644b589702cabcf8
Signed-off-by: David Garcia <david.garcia@canonical.com>

docker/LCM/Dockerfile

@@ -44,7 +44,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y git make
     python3-all python3-setuptools openssh-client libffi-dev libssl-dev \
     wget tox python3-cffi \
     && python3 -m pip install -U pip \
-    && python3 -m pip install -U juju==2.8.2 \
+    && python3 -m pip install -U juju==2.8.4 \
     && rm -rf /var/lib/apt/lists/*
 
 # RUN git clone https://osm.etsi.org/gerrit/osm/N2VC.git \

docker/MON/Dockerfile

@@ -61,7 +61,7 @@ RUN curl ${REPOSITORY_BASE}/${RELEASE}/${REPOSITORY_KEY} | apt-key add - \
                           python3-n2vc${N2VC_VERSION}
 
 
-RUN python3 -m pip install -U "juju==2.8.2"
+RUN python3 -m pip install -U "juju==2.8.4"
 
 COPY scripts/ scripts/