If the network is in Openstack it is needed to be deployed

#### Reviewers
@jframos @jesuspg

#### Description
if the network exists in Openstack, the paas manager does not have to deploy it
https://jira.tid.es/browse/CLAUDIA-4453
#### Test
Tested locally agains experimentacion testbed
This message is the same:
networkid = "The network "+  networkInstance.getNetworkName()+ " with id " + networkInstance.getIdNetwork()

And if the following is repeated in the code, you could use variable like this:
message1 = " does no exists in Openstack"
message2 = "..."
message3 = "..."