Fix default format of 'nova coverage-report'

'nova coverage-report' returns an error because nova server returns
error if the format is HTML and combine is False.
And 'nova coverage-start' and 'nova coverage-report' do it now.

After applying this patch, we can avoid this problem and text format
report is created when we use 'nova coverage-report'

Fixes bug 1110972

Change-Id: Ib3d05453de638157152a50ea814e44e6cbc19348
Add help about the id 'auto' for flavor-create

The id parameter of 'nova flavor-create' can be specified 'auto' now.
But the help document is not mentioned about that. This patch fixes it.

Fixes bug 1112154

Change-Id: I6df71746a0036c6b6d05467e28343fad2972c128
Live migration with an auto selection of dest.

Change-Id: I2e0880b0e5b0565e138ad7f72d88ccd7e431e79f
Blueprint: live-migration-scheduling
DocImpact:
Upgrade to pep8 1.3.3

Also expand scope of what is covered by pep8 test

Change-Id: Ifc8924914b5a0d625bc8df6442ee85eb21459cde
Merge "Add help about the id 'auto' for flavor-create"
Merge "Live migration with an auto selection of dest."
Merge "Fix default format of 'nova coverage-report'"