Remove unneeded definitions of Python Source Code Encoding

PEP 0263 (http://legacy.python.org/dev/peps/pep-0263/) is not
used anywhere else and should be removed when it's not needed.

Change-Id: I3f3d56b28001e2b27a4a749ecc9b3ac1c80a5b5c
Update requests to version 1.2.1

This version can specify max retries of HTTPAdapter.
Max retries of HTTPAdapter are used in Ceilometer.

Change-Id: Ifd07a3352808a26fd70e347c47ad9716e29739d3
Closes-bug: #1353909
Bump osprofiler version to >=0.3.0

We are using in glance stuff from version 0.3.0

Change-Id: Ic4761a9dae60a8291cb05b40c2bc53b97e19b101
Merge "Bump osprofiler version to >=0.3.0"
Merge "Update requests to version 1.2.1"
Merge "Remove unneeded definitions of Python Source Code Encoding"