CP-26298: Increase the max_stunnel in xapi

This commit is to increase the max_stunnel value when we support larger
number of hosts(64 etc) in a pool.

If max_stunnel is too small then sometimes a call from master to slave
will have higher latency than necessary, as the master will initiate
creation of a new TLS session instead of re-using an existing one.

Signed-off-by: Taoyong Ding <taoyong.ding@citrix.com>

Author: taoyongd

stunnel/stunnel_cache.ml

@@ -37,7 +37,7 @@ let debug = if debug_enabled then debug else ignore_log
 type endpoint = { host: string; port: int; verified: bool }
 
 (* Need to limit the absolute number of stunnels as well as the maximum age *)
-let max_stunnel = 22
+let max_stunnel = 70
 let max_age = 180. *. 60. (* seconds *)
 let max_idle = 5. *. 60. (* seconds *)