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
gt 120 chars.

The same comment, you are reusing this string in the code, you should create a string in order to call the string