Fix the way that instance manager finds the version number of instances,
  so that it works properly when the executable name isn't the same as what
  the instance-manager launched, such as when wrapping a libtool-wrapped
  executable from the source tree.

  This removes the 'Ver ' reported in the version column output by
  'SHOW INSTANCE STATUS ...', but the format of this column is not
  documented (and is pretty free-form to begin with).


server-tools/instance-manager/instance_options.cc:
  Look for 'Ver' to get version from running mysqld --version
server-tools/instance-manager/parse_output.cc:
  Make parse_output_and_get_value() look at the whole line to find
  the word, instead of just at the beginning of each line.
sql/mysqld.cc:
  Note that the instance manager relies on 'Ver' in mysqld --version