Remove bc dependency

Co-authored-by: Jeremy Denoun <jeremy.denoun@iguanesolutions.com>

lib/common.sh

@@ -112,3 +112,20 @@ sudo_wrapper() {
         crit "Not allowed to \"sudo -n $*\" "
     fi
 }
+
+#
+# Math functions
+#
+
+function div() {
+    local _d=${3:-2}
+    local _n=0000000000
+    _n=${_n:0:$_d}
+    if (($2 == 0)); then
+        echo "N.A"
+        return
+    fi
+    local _r=$(($1$_n / $2))
+    _r=${_r:0:-$_d}.${_r: -$_d}
+    echo $_r
+}