Revert "Change bm_availability_zone to nova"

This reverts commit d1fa6f1b0550ffc43870ea237243842e0bc60030.

Reason for revert: EU cloud team said to return to the BM zone. They have some issues with proper work of VLANs in VM AZ

PROD-35843


Change-Id: I719b97b3b8e214a34a3c11b4f73e8229d792fc26
diff --git a/tcp_tests/templates/_heat_environments/eu-cloud.env b/tcp_tests/templates/_heat_environments/eu-cloud.env
index 5fc6ace..4b04572 100644
--- a/tcp_tests/templates/_heat_environments/eu-cloud.env
+++ b/tcp_tests/templates/_heat_environments/eu-cloud.env
@@ -38,7 +38,7 @@
   vsrx_flavor: oc_vsrx
 
   key_pair: system_key_8133
-  bm_availability_zone: nova
+  bm_availability_zone: BM
   vm_availability_zone: nova
   net_public: public