Remove unused parameter "physical" in installOpenstackNetwork

The patch removes unused parameter from installOpenstackNetwork
definition because of the fact that it is not used in any pipelines
and function.

Change-Id: Ia11974b3510114712d421e09841187b2e2fb0d71
diff --git a/src/com/mirantis/mk/Orchestrate.groovy b/src/com/mirantis/mk/Orchestrate.groovy
index d9a50e8..c2f51c1 100644
--- a/src/com/mirantis/mk/Orchestrate.groovy
+++ b/src/com/mirantis/mk/Orchestrate.groovy
@@ -500,7 +500,7 @@
 }
 
 
-def installOpenstackNetwork(master, physical = "false", extra_tgt = '') {
+def installOpenstackNetwork(master, extra_tgt = '') {
     def salt = new com.mirantis.mk.Salt()
     //run full neutron state on neutron.gateway - this will install
     //neutron agents in addition to neutron server. Once neutron agents