osci.yaml: Increase ha-ovn job timeout

The ha-ovn jobs specifically are frequently taking at least 3h when
successful and often fail when almost finished with a timeout of 4h
(14400s) which is the timeout for the parent func-target job.

Increase the timeout for these specific jobs to 5h (18000s).

Change-Id: I1a973f5c39cb5e4886d6194b6b63ce0bea06e07b
(cherry picked from commit b25affc465)

osci.yaml

@@ -28,6 +28,7 @@
 - job:
     name: bionic-train-ha-ovn
     parent: func-target
+    timeout: 18000
     dependencies:
       - bionic-train-ha
     vars:
@@ -35,6 +36,7 @@
 - job:
     name: bionic-ussuri-ha-ovn
     parent: func-target
+    timeout: 18000
     dependencies:
       - bionic-train-ha
     vars:
@@ -49,6 +51,7 @@
 - job:
     name: focal-ussuri-ha-ovn
     parent: func-target
+    timeout: 18000
     dependencies:
       - bionic-train-ha
     vars:
@@ -56,6 +59,7 @@
 - job:
     name: focal-ussuri-ha
     parent: func-target
+    timeout: 18000
     dependencies:
       - bionic-train-ha
     vars: