fix glitch with flush_all <future>

reported by jhpark. items at the bottom of the LRU would be popped for sets if
flush_all was set for the "future" but said future hadn't arrived yet.
item_get handled this correctly so the flush would not happen, but items at
the bottom of the LRU would be reclaimed early.

Added tests for this as well.

items.c

@@ -106,7 +106,7 @@ item *do_item_alloc(char *key, const size_t nkey, const int flags, const rel_tim
     search = tails[id];
     if (search != NULL && (refcount_incr(&search->refcount) == 2)) {
         if ((search->exptime != 0 && search->exptime < current_time)
-            || (search->time < oldest_live)) {  // dead by flush
+            || (search->time <= oldest_live && oldest_live <= current_time)) {  // dead by flush
             STATS_LOCK();
             stats.reclaimed++;
             STATS_UNLOCK();

t/flush-all.t

@@ -1,7 +1,7 @@
 #!/usr/bin/perl
 
 use strict;
-use Test::More tests => 14;
+use Test::More tests => 21;
 use FindBin qw($Bin);
 use lib "$Bin/lib";
 use MemcachedTest;
@@ -40,5 +40,17 @@ is(scalar <$sock>, "OK\r\n", "did flush_all in future");
 print $sock "set foo 0 0 4\r\n1234\r\n";
 is(scalar <$sock>, "STORED\r\n", "stored foo = '1234'");
 mem_get_is($sock, "foo", '1234');
-sleep(2.2);
+sleep(3);
 mem_get_is($sock, "foo", undef);
+
+print $sock "set foo 0 0 5\r\n12345\r\n";
+is(scalar <$sock>, "STORED\r\n", "stored foo = '12345'");
+mem_get_is($sock, "foo", '12345');
+print $sock "flush_all 86400\r\n";
+is(scalar <$sock>, "OK\r\n", "did flush_all for far future");
+# Check foo still exists.
+mem_get_is($sock, "foo", '12345');
+print $sock "set foo2 0 0 5\r\n54321\r\n";
+is(scalar <$sock>, "STORED\r\n", "stored foo2 = '54321'");
+mem_get_is($sock, "foo", '12345');
+mem_get_is($sock, "foo2", '54321');