CLOUDSTACK-4533: fix two usage issues (db.properties and log4j-cloud.xml)

(1) Replacing db.properties with management server db.properties
(2) Rename log4j-cloud_usage.xml to log4j-cloud.xml
Revert "CLOUDSTACK-2792: Send "saved_password" to BACKUP router when reset password for user VM"

This reverts commit 5a8a2a259ea6e049b3e5810ff3a432d6ca7767e1.

We would fix it in another way, since mgmt server may get state updated in
time.

Conflicts:
	server/src/com/cloud/network/router/VirtualNetworkApplianceManagerImpl.java
CLOUDSTACK-4089: zone wizard > hypervisor VMware > if zoneType is Basic, not show vSwitchType dropdown in Edit Traffic Type for Guest.