oradb-manage-db: Replace broken .profile_* Envrionmentscript with ocenv

The old .profile_<SID> has some design problems and is from limited usage.
It has been replaced with the ocenv from https://github.com/opitzconsulting/oracle-scripts

Author: Rendanic

roles/oradb-manage-db/defaults/main.yml

@@ -1,5 +1,6 @@
 ---
 
+dbenvdir: "{{ oracle_user_home }}/dbenv"
 hostgroup: "{{ group_names[0] }}"
 oracle_dbca_rsp: "dbca_{{ dbh.oracle_db_name }}.rsp"        # Name of responsefile used by dbca. One per database
 oracle_netca_rsp: "netca_{{ dbh.home }}_{{ listener_name_template }}.rsp"