TT#30352 Scenario invite_retrans fails due to timeout

Fixed waiting time of scenario invite_retrans because it was creating
timeouts issues.

Change-Id: Ia843454df0d4e943f7f71860cc8273b586b3d737

scenarios/invite_retrans/sipp_scenario_responder00.xml

@@ -19,7 +19,7 @@
     ]]>
   </send>
 
-  <pause milliseconds="1500"/>
+  <pause milliseconds="1000"/>
 
   <send>
     <![CDATA[
@@ -36,7 +36,7 @@
     ]]>
   </send>
 
-  <pause milliseconds="5000"/>
+  <pause milliseconds="2500"/>
 
   <send>
     <![CDATA[