Python 3 binary-character fixes for two urllib requests (#4077)

* Fix python3 binary - character mismatch in api.py

Convert between text and binary data in api.py call to urllib.request
and response from it.

In python3 sqlmapapi -c it fixes, at least
- not nice output from log/list commands
- any command that POSTs data (including new) crashing sqlmapapi

* Fix python3 binary - character mismatch in search.py

Before:
python3 sqlmap.py -g <long random string>
(...)
[18:35:17] [INFO] using search result page #1
no usable links found. What do you want to do?
[1] (re)try with DuckDuckGo (default)
[2] (re)try with Bing
[3] quit
> 1
[18:35:21] [CRITICAL] unable to connect

After:
python3 sqlmap.py -g asfafw2fwesvzsdvaw
(...)
[18:37:30] [INFO] using search result page #1
no usable links found. What do you want to do?
[1] (re)try with DuckDuckGo (default)
[2] (re)try with Bing
[3] quit
> 1
[18:37:34] [INFO] found 26 results for your search dork expression, 16 of them are testable targets
[18:37:34] [INFO] found a total of 16 targets
URL 1:
GET https:...
do you want to test this URL? [Y/n/q]

lib/utils/api.py

@@ -713,7 +713,7 @@ def _client(url, options=None):
     try:
         data = None
         if options is not None:
-            data = jsonize(options)
+            data = jsonize(options).encode("utf-8")
         headers = {"Content-Type": "application/json"}
 
         if DataStore.username or DataStore.password:
@@ -721,7 +721,7 @@ def _client(url, options=None):
 
         req = _urllib.request.Request(url, data, headers)
         response = _urllib.request.urlopen(req)
-        text = response.read()
+        text = response.read().decode("utf-8")
     except:
         if options:
             logger.error("Failed to load and parse %s" % url)

lib/utils/search.py

@@ -132,7 +132,7 @@ def _search(dork):
             regex = DUCKDUCKGO_REGEX
 
         try:
-            req = _urllib.request.Request(url, data=data, headers=requestHeaders)
+            req = _urllib.request.Request(url, data=data.encode("utf-8"), headers=requestHeaders)
             conn = _urllib.request.urlopen(req)
 
             requestMsg = "HTTP request:\nGET %s" % url