Optimize memory usage in Agent.pm
Optimize memory usage in Agent.pm

- call method in Agent.pm was fetching data from Perun and then assgning
  these data from response to a local variable. That caused allocating new
  memory (size of the response). Method then worked with the new variable.
  That means that when the call method fetched 1GB of data from Perun,
  another 1GB was allocated due to the assignment.
- Change consists of removing the variable at all. Response is used
  right away instead of that.

zlamalp/perun,mvocu/perun,CESNET/perun,balcirakpeter/perun,mvocu/perun,zoraseb/perun,mvocu/perun,zwejra/perun,martin-kuba/perun,mvocu/perun,zwejra/perun,mvocu/perun,mvocu/perun,balcirakpeter/perun,zoraseb/perun,CESNET/perun,zwejra/perun,zlamalp/perun,martin-kuba/perun,zlamalp/perun,balcirakpeter/perun,zoraseb/perun,zwejra/perun,balcirakpeter/perun,CESNET/perun,CESNET/perun,balcirakpeter/perun,zlamalp/perun,balcirakpeter/perun,mvocu/perun,CESNET/perun,balcirakpeter/perun,zoraseb/perun,CESNET/perun,martin-kuba/perun,zlamalp/perun,martin-kuba/perun,martin-kuba/perun,zoraseb/perun,martin-kuba/perun,zoraseb/perun,martin-kuba/perun,zlamalp/perun,zwejra/perun,zwejra/perun,zlamalp/perun,CESNET/perun