Fixed misspellings of common words

Fixed misspelling of common words found by the 'misspellings' tool.

Closes-Bug: #1257531
Change-Id: Ic6bedbce3a242d6e1340ecc442d29605af8be9a4
Updated from global requirements

Change-Id: Ibca24abb665e28ebcb2010d036467c3cec7c7541
Add -U to pip install command in tox.ini

Ask pip to upgrade packages in the virtualenv so that a long-lived
virtualenv is still kept up to date as external dependencies change.

Change-Id: Id1e83aa5dd7c39d4827baeb39827b0ddeb8b6d4a
Merge "Add -U to pip install command in tox.ini"
Merge "Updated from global requirements"
Merge "Fixed misspellings of common words"