Added several tests for automation

different tests were included, as well as ssh inception and timeout to
exec.command.
Fixed the builder and tested with simple test

Added several methods into the scenario builder as well as
adapted the test_network_basic_multisubnet test to work
with the new builder.
changed nics to networks in create_server
Added the logic for ussing ssh inception

Also, corrected several bugs related to the ssh.py and added a test
that uses such technology.
Added the test vmconnectivity

Also, solved different bugs and added the logic behind the gateway.
Fixed legacy changes
update test_network_basic_adminstateup to new builder
Added metadata and dhcp_lease tests
Added dhcp disable test
Added test inter vmconnectivity
Added basic security groups test
Ported advanced tests

And implemeted associated functions in the manager.
Added scripts for launching tests
Fix the path for launching the tests with testr
Fix for loading scenarios dinamicaly
Fixed the path on the tests