Use --ignore-installed with pip install of swiftclient
Use --ignore-installed with pip install of swiftclient

When pip installing swiftclient test-requirements, pip might fail to
install PyYAML because of an existing installation of the
package. This can be avoided by using the --ignore-installed option.

swiftstack/vagrant-swift-all-in-one,swiftstack/vagrant-swift-all-in-one,swiftstack/vagrant-swift-all-in-one,swiftstack/vagrant-swift-all-in-one