Fixed CLOUDSTACK-6756: usage id is not being returned for an ip in deleted ip range
CLOUDSTACK-6761: Fixed removing proxy arp rule on deleting static nat or PF rule on ip

    The proxy-arp add/del is done on firewall rule add/del.
    The proxy-arp rule is deleted only when there is no static nat or dest nat rule is not using the ip.

    When there is static nat or PF and firewall rule
     a. Delete firewall rule. It skips delete proxy-arp because the rule is used by static nat rule.
     b. After deleting fw rule if we disable static nat there is no way to delete proxy-arp rule.

     On VM expunge we are deleting firewall rules first then static nat rules. This caused the stale proxy-arp
     rules.

    With this fix adding/deleting proxy arp rule on static nat/PF rule add/del.
CLOUDSTACK-6328: run.sh check if an existing java process is running, before spawining new ones

Signed-off-by: Jayapal <jayapal@apache.org>
CLOUDSTACK-6663: Fixed Hyper-V agent fails to start on some setups. During startup agent tries
to get nic info of 0.0.0.0. To get it, it iterates through all nics and return the last NIC in
the list if it doesn't match with any IP address. In case last NIC doesn't have unicastAddress,
Hyper-V agent will fail to start. We don't need IP address during initialization. It get
initialized with startupcommand later.
CLOUDSTACK-6328: added license header and removed white space