By default, when one uses `in` assertions, upon failure newlines in any of the two strings is escaped, and everything is printed in a single line. This commit allows one to pass `-vv` to print out the left and righthand side unescaped, with each line of the output being its own line, improving readability a lot when dealing with multiline outputs. Change-Id: Iaf67a20fce57d375e2c62a8e8a0957b14eec26ef