Bug 1786276

Description of problem:
SLAVE positional argument doesn't provide a clear picture of what it is when compared to mastervol and slavevol in schedule_georep.py.in. It would be better if we change it to something like "Slave hostame (<username>@SLAVEHOST or SLAVEHOST)"

Present:
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positional arguments:
  mastervol            Master Volume Name
  SLAVE                SLAVEHOST or root@SLAVEHOST or user@SLAVEHOST 
  slavevol             Slave Volume Name


Suggested:
-----------
positional arguments:
  mastervol            Master Volume Name
  SLAVE                Slave hostname (<username>@SLAVEHOST or SLAVEHOST)
  slavevol             Slave Volume Name


Version-Release number of selected component (if applicable):
Whatever it the latest

How reproducible:
Always

Steps to Reproduce:
1.
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Actual results:


Expected results:


Additional info: