Zabbix

.......PS. [ZBXNEXT-2880] added access to vmware datastore at vmware vCenter level

* commit '4bc6b4afa440d308e2ee329327ad83fbc1e62741': (32 commits)
  .......PS. [ZBXNEXT-2880] added ChangeLog entry
  .......PS. [ZBXNEXT-2880] fixed case with empty result of vmware_service_get_counter_value_by_id()
  .......PS. [ZBXNEXT-2880] debug message impovement
  .......PS. [ZBXNEXT-2880] remove code redundancy
  .......PS. [ZBXNEXT-2880] replace Units to % for 'Free space on datastore {#DATASTORE} (percentage)'
  .......PS. [ZBXNEXT-2880] reduce code duplication for 'check_vcenter_hv_datastore_(read/write)'
  .......PS. [ZBXNEXT-2880] reduce code duplication for vcenter_datastore functions
  .......PS. [ZBXNEXT-2880] fixed returning of empty hypervisor/datastore list
  .......PS. [ZBX-2880] return empty result for 'check_vcenter_hv_datastore_list' and 'check_vcenter_datastore_hv_list'
  .......PS. [ZBXNEXT-2880] changed quotes in error message, fixed hypervisor datastore checks
  .......PS. [ZBX-2880] change error messages
  .......PS. [ZBX-2880] the 'flag' refactoring
  .......PS. [ZBX-2880] revert changes of error messages
  .......PS. [ZBX-2880] change error messages
  .......PS. [ZBX-2880] return an error in the result for an unknown datastore name for any cases
  .......PS. [ZBX-2880] debug message change
  .......PS. [ZBX-2880] change link HV with DS to 'name'
  .......PS. [ZBX-2880] improved error message generation logic
  .......PS. [ZBX-2880] fix of ISO C90 warning
  .......PS. [ZBX-2880] removed empty line
  ...