Ability to mount FS mount storage by exact path

[SilinPavel]

Background Now we are using FS shareMount as a root mount point for all FS storage with such shareMount in application services such as cp-api-srv and cp-search-srv. In some cases it would be beneficial to mount specific Shared FS location with exact path (f.e. when permissions on NFS allows only specific folders to be mounted).

Approach Let's introduce new field of the DataStorage object mountExactPath (boolean, default false) if true - such storage will be mounted to the API container with exact path. This property can be specified only during storage creation. (DataStorageVO now also accepts mountExactPath value)