test/common: add bc to vm_setup.sh

bc is currently used in iSCSI qos.sh test, but is not listed
as a pre-requisite in vm_setup.sh
Also it's a good alternative to using sed or awk for some
simple math operations.

Change-Id: I18742c0dedcdcc5eeebd310eb5760e226a163af7
Signed-off-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/453998
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Pawel Kaminski <pawelx.kaminski@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>

test/common/config/vm_setup.sh

@@ -462,7 +462,8 @@ if $INSTALL; then
         python3-pandas \
         btrfs-progs \
         rpm-build \
-        iptables
+        iptables \
+        bc
 
     elif [ $PACKAGEMNG == 'apt-get' ]; then
         echo "Package perl-open is not available at Ubuntu repositories" >&2
@@ -523,7 +524,8 @@ if $INSTALL; then
         sshfs \
         sshpass \
         python3-pandas \
-        btrfs-tools
+        btrfs-tools \
+        bc
 
         # rpm-build is not used
         # iptables installed by default