kdump-lib: fix get_option_value()

get_option_value() is used to get the value of $1 configured in
/etc/kdump.conf. But when we use "get_option_value ssh", it can get the
value of "sshkey" instead of "ssh".

Fix the regexp pattern to get an exact match.

Signed-off-by: WANG Chao <chaowang@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>

kdump-lib.sh

@@ -109,7 +109,7 @@ get_mntpoint_from_target()
 # get_option_value <option_name>
 # retrieves value of option defined in kdump.conf
 get_option_value() {
-    echo $(strip_comments `grep ^$1 /etc/kdump.conf | tail -1 | cut -d\  -f2-`)
+    echo $(strip_comments `grep "^$1[[:space:]]\+" /etc/kdump.conf | tail -1 | cut -d\  -f2-`)
 }
 
 #This function compose a absolute path with the mount