fix: json schema for join tag

[hugbe8]

mappyfile: Version: 0.8.2

fix: schema layer.json for joins tag
fix: schema join.json for connectiontype tag

Note: The validate function does not manage the tag: joins and connectiontype, while the transform fonction (map to json) does it.

Reference: https://mapserver.org/mapfile/join.html

Error received on the validate function:

{'error': "'joins' does not match any of the regexes: '^__[a-z]+__$'", 'message': 'ERROR: Invalid value in LAYER'}
{'error': "'connectiontype' does not match any of the regexes: '^__[a-z]+__$'", 'message': 'ERROR: Invalid value in JOIN'}

MapFile abstract:

JOIN
	NAME 'table_join'
	CONNECTION "dbname=bd_test host=host_test port=5432 user=mapserver password={***}"
	CONNECTIONTYPE postgresql
	TABLE 'sch.table_join'
	FROM 'no_link'
	TO 'no_link'
	TYPE ONE-TO-MANY
	TEMPLATE "../gabarits/gabarit_join.html"
END

JSON-MapFile Abstract:

"joins": [
	{
		"__type__": "join",
		"name": "table_join",
		"connection": "dbname=bd_test host=host_test port=5432 user=mapserver password={***}",
		"connectiontype": "postgresql",
		"table": "sch.table_join",
		"from": "no_link",
		"to": "no_link",
		"type": "ONE-TO-MANY",
		"template": "../gabarits/gabarit_join.html"
	}
],

[coveralls]

Pull Request Test Coverage Report for Build 396

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 90.212%

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Totals
Change from base Build 393:	-0.3%
Covered Lines:	5539
Relevant Lines:	6140

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💛 - Coveralls

[geographika]

@hugbe8 - thanks for this. I double-checked mapfile.c that a layer can have multiple joins (I couldn't find this in the docs or msautotest). Coveralls percentage has dropped somehow, but the JSON looks good.