ENG-16553: Use in to test for substring
ENG-16553: Use in to test for substring

resize.py uses str.find() to test if a sub string is in a string but this
method is more equivalent to indexof which means performing an if on the result
will be false if "host ids" is at the start of the string or be true if it
isn't in it at all.

Use the keyword in to test if a sub string is part of another string.
Do not use the variable name type since that is python builtin.

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