Add tab key as delimiter for core_collector in kdump.conf

In kdump.conf, space key is used as delimiter by default.

In kdump_install_conf of dracut-module-setup.sh, if specify
core_collector with a tab delimiter, the tool may not be
copied into kdump-initrd.
E.g, core_collector scp		-v

And in dump_ssh of dracut-kdump.sh, dumping will fail caused
by tab key in core_collector.

Here change code to allow tab key as delimiter when specifying
core_collector.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

dracut-kdump.sh

@@ -112,7 +112,7 @@ dump_ssh()
 
     save_vmcore_dmesg_ssh ${DMESG_COLLECTOR} ${_dir} "${_opt}" $2
 
-    if [ "${CORE_COLLECTOR%% *}" = "scp" ]; then
+    if [ "${CORE_COLLECTOR%%[[:blank:]]*}" = "scp" ]; then
         scp -q $_opt /proc/vmcore "$2:$_dir/vmcore-incomplete" || return 1
         ssh $_opt $2 "mv $_dir/vmcore-incomplete $_dir/vmcore" || return 1
     else

dracut-module-setup.sh

@@ -251,7 +251,7 @@ kdump_install_conf() {
             dracut_install $config_val
             ;;
         core_collector)
-            dracut_install "${config_val%% *}"
+            dracut_install "${config_val%%[[:blank:]]*}"
             ;;
         esac
     done < /etc/kdump.conf