maxmem tests should be run solo for higher reliability

Author: JohnSully

tests/unit/maxmemory.tcl

@@ -1,3 +1,4 @@
+run_solo {maxmemory} {
 start_server {tags {"maxmemory"}} {
     test "Without maxmemory small integers are shared" {
         r config set maxmemory 0
@@ -244,4 +245,4 @@ test_slave_buffers {slave buffer are counted correctly} 1000000 10 0 1
 # test that slave buffer don't induce eviction
 # test again with fewer (and bigger) commands without pipeline, but with eviction
 test_slave_buffers "replica buffer don't induce eviction" 100000 100 1 0
-
+} ;# run_solo