Fix typo in ssh_floating.json for stress tests

check_interval was spelled check_inerval, missing the 't'
Closes bug #1267473

Change-Id: I2cbeba11d4389472925b30b2029e170c034cf44a
diff --git a/tempest/stress/etc/ssh_floating.json b/tempest/stress/etc/ssh_floating.json
index 0cb6776..e03fd4f 100644
--- a/tempest/stress/etc/ssh_floating.json
+++ b/tempest/stress/etc/ssh_floating.json
@@ -8,7 +8,7 @@
              "new_floating": true,
              "verify": ["check_icmp_echo", "check_port_ssh"],
              "check_timeout": 120,
-             "check_inerval": 1,
+             "check_interval": 1,
              "wait_after_vm_create": true,
              "wait_for_disassociate": true,
              "reboot": false}