Small fixes for 4.5

[Rendanic]

minor_changes:

• Change Shebang to /usr/bin/env bash (Small fixes for 4.5 #409)
• oradb_manage_db: Assert SYS password in inventory before dbca (Small fixes for 4.5 #409)
• minor fixes for role separation in Oracle Restart (Small fixes for 4.5 #409)

bugfixes:

• orasw_meta: Removed warning from ansible (Small fixes for 4.5 #409)

breaking_changes:

• orahost: Removed fixed password for oracle and grid from defaults (Small fixes for 4.5 #409)
• orasw_meta: Removed default passwords from default_dbpass and dbpasswords (Small fixes for 4.5 #409)
• Removed oracle_password - use default_gipass as replacement (Small fixes for 4.5 #409)
• oraswgi_install: Removed default password from default_gipass (Small fixes for 4.5 #409)

security_fixes:

• orahost: Removed fixed password for oracle and grid from defaults (Small fixes for 4.5 #409)
• orasw_meta: Removed default passwords from default_dbpass and dbpasswords (Small fixes for 4.5 #409)
• oraswgi_install: Removed default password from default_gipass (Small fixes for 4.5 #409)

[Rendanic]

fixes #327