Rename campaigns date fields

[hectorgomezv]

Summary

Some Campaign field names have been changed from the Safe Locking Service original specification. Specifically:

• periodStart has been renamed as startDate.
• periodEnd has been renamed as endDate.
• activities has been renamed as activitiesMetadata.

Changes

• Renames periodStart as startDate.
• Renames periodEnd as endDate.
• Renames activities as activitiesMetadata.

[coveralls]

Pull Request Test Coverage Report for Build 9109807864

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 93.093%

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Totals
Change from base Build 9109481366:	0.03%
Covered Lines:	7076
Relevant Lines:	7322

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💛 - Coveralls