Fixes for more cppcheck issues (v2 of #101)

Reviewed-by: Sage Weil <sage@inktank.com>

ignore errors on informational service status

mgr/dashboard_v2: Create links to perf counters

* add rapidjson header files (https://github.com/Tencent/rapidjson master);  add test application
* add google-test, comparing sax parser against dom parser; editorial changes
* add rapidjson [https://github.com/Tencent/rapidjson.git] as submodule. the package has been used in CEPH is too old, not contain the iterative parsing that enables the chunk-by-chunk parsing
* filter key-path
* from-clause accepts JSON structure
* adding JSON SQL statements to be accepted by the s3select-parser. (*) new variable definition for JSON, enable access for a specific key path by the projection statements and where-clause predicates (*) editorial changes.
(*) add execution flow for JSON query processing. it is not cover all planned use-cases
(*) the JSON parser pushes JSON-values to scratch-area upon identifying matching key-path
(*) upon JSON parser is identifying a complete row it initiates s3select execution flow
(*) fix for the aggregation flow
(*) fix for execution flow upon end-of-input
(*) bug fix for column values
(*) the aggregation is not accurate, it misses the last part of the last chunk
* add case insensitive to assert
* fix for aggregation flow(end-of-stream).  fix case insensitive
* fix for language definition to accept when/case statement as an expression.
* fix for error handling in the test.
* fix for exception handling.
* add error handling.
* a fix(temporary) for the use-case where the value is very long and may cause parsing failure upon chunk "cut" that in the middle
* add an efficient flow for extracting JSON values, the flow minimizes the amount of data extraction by removing duplicate JSON-variables
* fix for language definition to accept when/case statement as an expression.
* rebase with row_definitions_rules
* fix the execution flow per JSON, "break" the loop per each row
* a fix for the use-case where the from-clause is empty.
* JSON-parser: adding member-data for better describing the state of each key-value
* adding JSON test queries to the main g-test
* fix for exact-match filter (json variables)
* fix for result handling
* add star operation per JSON queries.
upon star-operation(select *) the engine&JSON-parser extract *all* key-full-path and value according to from-clause and where-clause(if exists).
engine&parser should be aware to JSON statement syntax, and to star-operation reside in SQL statement.
the result per star-operation is displayed differently, with each column on a separate line, and each resulted row ends with row-number.
* error handling: upon runtime error, to handle the exception
* a fix for syntax-parser (push_json_variable)
* fix for json-from-clause (remove strdup)

Signed-off-by: gal salomon <gal.salomon@gmail.com>
Signed-off-by: Albin Antony <aantony@redhat.com>
Co-authored-by: Albin Antony <aantony@redhat.com>

…ctly

Merge in STORAGEENG/ceph from bugfix/CEPH-214-missing-element-from-listmultipartuploads-ceph-response-qa to aka_version_18.2.1

* commit 'c6f6a3979fc36eabf6ccc260182be80bc303ca40':
  Handle multiple common prefixes correctly