Add support to escape special characters in query filter for api v35.0+

[rocknes]

For api v35.0+, vCD requires special characters viz. ( ) ; , to be escaped if used as value in query filter.
In _AbstractQuery, we escape the special characters in encoded filter value.

Additional changes,

1. Replaced usage of quote_plus to quote, since quote_plus will replace spaces with + and thus can cause the filter value to distort.
2. Encoded all usage of qfilter in get_typed_query, since this field should be encoded by caller.

Testing done:
Ran all vcd-cli commands that invoke the affected methods at api v35.0 and made sure that all these commands returned expected result.

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This change is 

[shashim22]

Reviewed 9 of 9 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved