Avni to Bahmni - Date related issues

[hithacker]

• Visit date - Use OpenMRS patient creation date(there is no concept of reg date in OpenMRS so we will use patient audit date)
• Encounter date - set to be same as Avni encounter date
• Enrolment date - set to be same as Avni enrolment date
• Registration encounter date - set to be same as Avni subject registration date
• Set birth date when creating new empty patient in OpenMRS