Internal booking:show warning when campground is closed, but do allow…

[FatemehMoghadam]

… booking

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 521

• 15 of 57 (26.32%) changed or added relevant lines in 4 files are covered.
• 595 unchanged lines in 10 files lost coverage.
• Overall coverage decreased (-0.3%) to 39.264%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
parkstay/models.py	1	2	50.0%
parkstay/serialisers.py	4	6	66.67%
parkstay/api.py	1	11	9.09%
parkstay/utils.py	9	38	23.68%

Files with Coverage Reduction	New Missed Lines	%
mooring/urls.py	1	0.0%
parkstay/models.py	1	54.38%
ledger/payments/bpay/crn.py	1	55.22%
mooring/serialisers.py	2	0.0%
parkstay/api.py	3	18.6%
parkstay/utils.py	3	49.59%
mooring/pdf.py	38	0.0%
mooring/views.py	90	0.0%
mooring/utils.py	149	0.0%
mooring/api.py	307	0.0%

Totals
Change from base Build 511:	-0.3%
Covered Lines:	11462
Relevant Lines:	29192

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💛 - Coveralls

[scottp-dpaw]

Reviewed 11 of 11 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved