Formatting and tab errors in the new test suites for limits

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit f5eb81e669a8a454fc02b90a44c4ce8ffc7ac9ac)
cpu_limits module of tests
(cherry picked from commit a6117192f8e6d74227af70af29e0eee86868230f)
Before 4.X TO 4.2 upgrade manually clean up /var/cache/cloudstack
CLOUDSTACK-4538: fix small typo