Add get_option_value()

Adds get_option_value() function to retrieve value of specified option
from /etc/kdump.conf.

Bug-Url: https://bugzilla.redhat.com/1078134
Signed-off-by: Martin Perina <mperina@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

kdump-lib.sh

@@ -75,3 +75,9 @@ get_root_fs_device()
     return
 }
 
+# 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-`)
+}
+