Update vcat.py (#196)

* Update vcat.py

Author: andamian

vos/setup.cfg

@@ -50,7 +50,7 @@ edit_on_github = False
 github_project = opencadc/vostools
 install_requires = html2text>=2016.5.29 cadcutils>=1.2.1 future aenum
 # version should be PEP440 compatible (http://www.python.org/dev/peps/pep-0440)
-version = 3.3.3
+version = 3.3.4
 
 
 [entry_points]

vos/vos/commands/vcat.py

@@ -20,8 +20,9 @@ def _cat(uri, cert_filename=None, head=None):
     fh = None
     try:
         view = head and 'header' or 'data'
-        fh = Client(vospace_certfile=cert_filename).open(uri, view=view)
-        if fh.is_remote_file(uri):
+        c = Client(vospace_certfile=cert_filename)
+        fh = c.open(uri, view=view)
+        if c.is_remote_file(uri):
             sys.stdout.write(fh.read(return_response=True).text)
             sys.stdout.write('\n\n')
         else: