adding deprecation warning to gracedb_legacy

ligo/gracedb/legacy_cli.py

@@ -188,7 +188,6 @@ def main(args=None):
 
 Environment Variables:
     GRACEDB_SERVICE_URL   (can be overridden by --service-url)
-    HTTP_PROXY            (can be overridden by --proxy)
     X509_USER_PROXY
     X509_USER_CERT
     X509_USER_KEY
@@ -209,8 +208,6 @@ Longer strings will be truncated.""" % {
 
     from optparse import OptionParser
     op = OptionParser(usage=usage)
-    op.add_option("-p", "--proxy", dest="proxy",
-                  help="HTTP Proxy", metavar="PROXY[:PORT]")
     op.add_option("-s", "--service-url", dest="service",
                   help="GraCEDb Service URL", metavar="URL")
     op.add_option("-f", "--filename", dest="filename",
@@ -273,7 +270,11 @@ Longer strings will be truncated.""" % {
         else:
             pass
 
-    proxy = options.proxy or os.environ.get('HTTP_PROXY', None)
+    # warn users about depreciation
+    warning("The gracedb_legacy CLI has been deprecated and "
+        "will be removed in a future release. Please use the updated "
+        "gracedb CLI or available API tools for your workflow.")
+
     service = options.service or \
               os.environ.get('GRACEDB_SERVICE_URL', None) or \
               DEFAULT_SERVICE_URL