improve node template

[katia-e]

Closes #43

• Logic changes:
  • if machine exists but state of install action is not OK, machine is deleted
  • portforwards can be added only via action.
• Fix docs.
• Add test.

[codecov-io]

Codecov Report

Merging #72 into master will decrease coverage by 3%. The diff coverage is 85%.

@@          Coverage Diff           @@
##           master    #72    +/-   ##
======================================
- Coverage      90%    87%    -4%     
======================================
  Files          10     14     +4     
  Lines         863   1564   +701     
======================================
+ Hits          781   1364   +583     
- Misses         82    200   +118

Impacted Files	Coverage Δ
templates/account/test_account.py	94% <ø> (ø)	:arrow_up:
templates/disk/test_disk.py	100% <100%> (ø)
templates/disk/disk.py	33% <16%> (ø)
templates/node/node.py	89% <85%> (ø)
templates/node/test_node.py	96% <96%> (ø)

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[katia-e]

Added methods to attach/detach disks. Improved _configure_disks method. On disk template added install/uninstall methods

[katia-e]

• disk: install/uninstall methods
• node: disk_attach, disk_detach, disk_add, disk_delete
• updates tests and docs