Use slickrpc instead of the authproxy from rpc-tests

Removes the cross-repo dependency.

The README change doesn’t indicate a new dependency, the existing code was
already depending on slick-bitcoinrpc.

README.md

@@ -1,2 +1,6 @@
 # zcash-graphs
 A collection of scripts for collecting and graphing data about the Zcash chain
+
+## dependencies
+
+- `slick-bitcoinrpc` (which depends on `libssl-dev` and `libcurl4-openssl-dev`)

analysis/analyze.py

@@ -16,17 +16,10 @@ import math
 import numpy as np
 import os.path
 from progress.bar import IncrementalBar
+from slickrpc.rpc import Proxy
 from statistics import mean
 import sys
 
-sys.path.insert(
-    1,
-    os.path.join(os.path.dirname(os.path.abspath(__file__)),
-                 "../../qa/rpc-tests")
-)
-
-from test_framework.authproxy import AuthServiceProxy
-
 ### TODO: Get host/port from config
 if len(sys.argv) > 1:
     connection_string = sys.argv[1]
@@ -146,7 +139,7 @@ class Analysis:
 
 class Analyzer:
     def __init__(self, node_url):
-        self.node = AuthServiceProxy(node_url)
+        self.node = Proxy(node_url)
 
     def analyze_blocks(self, block_range, analyses):
         """