Do some cleanups to start-kubemark.sh.
1. Add double quotes around variables which are expanded. This is done
even on those variables which probably won't have spaces, globs or
similar (such as $MASTER_IP) to stay consistent.
2. In one place, change old-type `...` subshell invocation to $(...) to
stay consistent through the file.
3. Remove useless echo commands in expressions: FOO=$(echo "$bar")
becomes FOO="$bar".
4. In a few places, remove double quotes around variables when an
expression is already inside them: the variables would have been
effectively unquoted.
The last change in the patch changes the printing a bit -- the old way
did not print whitespace correctly due to inner echo missing the quotes
around it. The change should fix the printout:
- echo $(echo "${pods}" | grep -v "Running")
+ echo "${pods}" | grep -v Running
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