reclass, states: Parametrize runtime configuration

reclass, states: Parametrize runtime configuration

mcpcontrol virsh network, as well as MaaS PXE network are installer
specific, and not POD specific.
Therefore, these should be easily parametrized without the PDF,
using only installer inputs (e.g. env vars passed via Jenkins).

- add new <all-mcp-ocata-common.opnfv.runtime> reclass class;
- parametrize at runtime new reclass class based on global vars;
- factor out MaaS deploy address / config using new mechanism;
- parametrize at runtime virsh network definitions based on template;
- add new "maas.pxe_route" sls for configuring routing on cfg01;
- replace env vars with the new sls in "maas" state;

NOTE: baremetal parametrization will be handled later.

Change-Id: Ifd61143d818fb088b3f4395388ba769bbc49156e
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>