Merge changes I5d215880,Ic2f8f861,I2b558d6d,Ie18578b1,I7e3abdf3, ...

* changes:
  Comply the constructor declaration to std.
  HttpConnection does not thru exception
  Remove unused class from the imports
  Fix the HEAD name in http profile
  Reuse constant names across
  Remove unused imports from Auth Client
  Del invalid excep throws in OnapCommand getSchema
  Add hashCode() for SchemaInfo