Make fast calculation of DH params optional

src/freedombone-dhparam

 HOSTNAME=
 KEYLENGTH=2048
 RECALCULATE="no"
+FAST=''
 
 function show_help {
     echo ''
-    echo $"${PROJECT_NAME}-dhparam -h [hostname] -l [length in bits] --recalc [yes|no]"
+    echo $"${PROJECT_NAME}-dhparam -h [hostname] -l [length in bits] --recalc [yes|no] --fast [yes|no]"
     echo ''
     exit 0
 }
 
 function calc_dh {
-    openssl dhparam -check -text -dsaparam $KEYLENGTH -out ${1}
+    openssl dhparam -check -text $FAST $KEYLENGTH -out ${1}
     if [ ! "$?" = "0" ]; then
         exit 3674
     fi
     shift
     RECALCULATE=${1}
     ;;
+    --fast)
+    shift
+    if [[ ${1} == "yes" || ${1} == "y" ]]; then
+        FAST='-dsaparam'
+    fi
+    ;;
     *)
     # unknown option
     ;;