Add a way to run a command without updating the cached credentials.

This can also be used to test for whether or not the user's
credentials are currently cached.

src/sudo.h

@@ -84,27 +84,28 @@
 #define ARG_USER_SHELL		 5
 #define ARG_LOGIN_SHELL		 6
 #define ARG_IGNORE_TICKET	 7
-#define ARG_PROMPT		 8
-#define ARG_SELINUX_ROLE	 9
-#define ARG_SELINUX_TYPE	10
-#define ARG_RUNAS_USER		11
-#define ARG_PROGNAME		12
-#define ARG_IMPLIED_SHELL	13
-#define ARG_PRESERVE_GROUPS	14
-#define ARG_NONINTERACTIVE	15
-#define ARG_SUDOEDIT		16
-#define ARG_CLOSEFROM		17
-#define ARG_NET_ADDRS		18
-#define ARG_MAX_GROUPS		19
-#define ARG_PLUGIN_DIR		20
-#define ARG_REMOTE_HOST		21
-#define ARG_TIMEOUT		22
-#define ARG_CHROOT		23
-#define ARG_CWD			24
-#define ARG_ASKPASS		25
-#define ARG_INTERCEPT_SETID	26
-#define ARG_INTERCEPT_PTRACE	27
-#define ARG_APPARMOR_PROFILE	28
+#define ARG_UPDATE_TICKET	 8
+#define ARG_PROMPT		 9
+#define ARG_SELINUX_ROLE	10
+#define ARG_SELINUX_TYPE	11
+#define ARG_RUNAS_USER		12
+#define ARG_PROGNAME		13
+#define ARG_IMPLIED_SHELL	14
+#define ARG_PRESERVE_GROUPS	15
+#define ARG_NONINTERACTIVE	16
+#define ARG_SUDOEDIT		17
+#define ARG_CLOSEFROM		18
+#define ARG_NET_ADDRS		19
+#define ARG_MAX_GROUPS		20
+#define ARG_PLUGIN_DIR		21
+#define ARG_REMOTE_HOST		22
+#define ARG_TIMEOUT		23
+#define ARG_CHROOT		24
+#define ARG_CWD			25
+#define ARG_ASKPASS		26
+#define ARG_INTERCEPT_SETID	27
+#define ARG_INTERCEPT_PTRACE	28
+#define ARG_APPARMOR_PROFILE	29
 
 /*
  * Flags for tgetpass()