Added installation of 'iperf' package to the offline images and pods

Added installation of 'iperf' package to the offline images due to
the fix in mos-spt (https://gerrit.mcp.mirantis.com/c/mcp/mos-spt/+/138830):
using iperf (v2) tool for the multiple threads test cases.

Related-PROD: PROD-36943
Change-Id: I157da5f37678b54cacdcdb38b3ea45aba347bd0a
diff --git a/k8s/docker-mos-toolset-full b/k8s/docker-mos-toolset-full
index 5876ad3..b621299 100644
--- a/k8s/docker-mos-toolset-full
+++ b/k8s/docker-mos-toolset-full
@@ -16,7 +16,7 @@
 
 RUN export TZ="America/Chicago" && \
     ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && \
-    apt-get install -y python3-pip python3-venv vim git iperf3 mtr htop iputils-ping traceroute tcpdump wget iproute2 curl screen qemu-utils
+    apt-get install -y python3-pip python3-venv vim git iperf3 iperf mtr htop iputils-ping traceroute tcpdump wget iproute2 curl screen qemu-utils
 
 RUN curl https://baltocdn.com/helm/signing.asc | apt-key add - && \
     apt-get install apt-transport-https --yes && \
@@ -50,7 +50,7 @@
 
 RUN mkdir /opt/packages/ && \
     cd /opt/packages && \
-    apt-get download $(apt-cache depends --recurse --no-recommends --no-suggests --no-conflicts --no-breaks --no-replaces --no-enhances iperf3 fio | grep "^\w" | sort -u) || true
+    apt-get download $(apt-cache depends --recurse --no-recommends --no-suggests --no-conflicts --no-breaks --no-replaces --no-enhances iperf3 iperf fio | grep "^\w" | sort -u) || true
 
 RUN curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" && \
     install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl && \