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Due to a bug the was fixed in Python-2.7, in Python-2.6 unicode strings
that are written to sys.stdout (using sys.stdout.write) are not
converted to bytestrings using the file.encoding. Instead
sys.stdout.encoding is set to None, and the default encoding is used. We
solve this by creating a wrapper to stdout, and encoding everything
either with the file encoding, or with the `locale` prefered encoding.

Ignore offline backends when computing the state of the network, since
no notification will be received from them. Also, create no
BackendNetwork for an offline backend. This will be created by
reconcilliation, when the backend gets online again.

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Add the Pooling and Greenlets section in the Quick Installation
Guide. Also make some minor adjustments concerning Astakos
default configuration values.

In the future quick-admin-installation-guide will be for one node
only.
Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

Update admin guide: move section about creation of pools after
installing snf-cyclades-app

Conflicts:
	docs/quick-install-admin-guide.rst

Refs #3097

Use image_backend context manager to ensure that ImageBackend is always
closed. list_images method did not close the ImageBackend, which
resulted in depletion of the Pithos backend connection pool.