Added Custom Openssl Path for Native Clients

This Parameter helpful where openssl path is not fixed always, we can also use this to reduce code verbosity by providing other like these and provide them as parameter
```
            if sys.platform.startswith("win"):
                self.openssl_bin = "tools\\openssl\\openssl.exe"
            elif config.dist_type.startswith("bundle_linux"):
                self.openssl_bin = "../runtime/bin/openssl"
            else:
                self.openssl_bin = "openssl"
```

Also Fixed Tracker files provided are not loading on some systems like Android client where path storage access is restricted

src/Config.py

@@ -31,6 +31,7 @@ class Config(object):
 
         self.config_file = self.start_dir + "/zeronet.conf"
         self.data_dir = self.start_dir + "/data"
+        self.openssl_path = "default"
         self.log_dir = self.start_dir + "/log"
 
         self.trackers_file = False
@@ -108,6 +109,7 @@ class Config(object):
 
         config_file = self.start_dir + "/zeronet.conf"
         data_dir = self.start_dir + "/data"
+        openssl_path = "default"
         log_dir = self.start_dir + "/log"
 
         ip_local = ["127.0.0.1", "::1"]
@@ -259,6 +261,7 @@ class Config(object):
         self.parser.add_argument('--ip_external', help='Set reported external ip (tested on start if None)', metavar='ip', nargs='*')
         self.parser.add_argument('--offline', help='Disable network communication', action='store_true')
 
+        self.parser.add_argument('--openssl_path', help='Custom Path to OpenSSL Binary', default=openssl_path, metavar="path")
         self.parser.add_argument('--disable_udp', help='Disable UDP connections', action='store_true')
         self.parser.add_argument('--proxy', help='Socks proxy address', metavar='ip:port')
         self.parser.add_argument('--bind', help='Bind outgoing sockets to this address', metavar='ip')
@@ -321,6 +324,9 @@ class Config(object):
                     trackers_file_path = trackers_file
                 elif trackers_file.startswith("{data_dir}"):  # Relative to data_dir
                     trackers_file_path = trackers_file.replace("{data_dir}", self.data_dir)
+                elif trackers_file.startswith("data/"):
+                    # Relative to data_dir Useful for Unix Type Systems and Android Clients
+                    trackers_file_path = trackers_file.replace("data", self.data_dir)
                 else:  # Relative to zeronet.py
                     trackers_file_path = self.start_dir + "/" + trackers_file
 
@@ -479,7 +485,7 @@ class Config(object):
             for key, val in args.items():
                 if type(val) is list:
                     val = val[:]
-                if key in ("data_dir", "log_dir"):
+                if key in ("data_dir", "log_dir", "openssl_path"):
                     val = val.replace("\\", "/")
                 setattr(self, key, val)
 
@@ -563,6 +569,7 @@ class Config(object):
 
             "log_dir": os.path.abspath(self.log_dir),
             "data_dir": os.path.abspath(self.data_dir),
+            "openssl_path": os.path.abspath(self.openssl_path),
             "src_dir": os.path.dirname(os.path.abspath(__file__))
         }
 

src/Crypt/CryptConnection.py

@@ -11,12 +11,15 @@ from util import helper
 
 class CryptConnectionManager:
     def __init__(self):
-        if sys.platform.startswith("win"):
+        if config.openssl_path != "default":
-            self.openssl_bin = "tools\\openssl\\openssl.exe"
+            self.openssl_bin = config.openssl_path
-        elif config.dist_type.startswith("bundle_linux"):
-            self.openssl_bin = "../runtime/bin/openssl"
         else:
-            self.openssl_bin = "openssl"
+            if sys.platform.startswith("win"):
+                self.openssl_bin = "tools\\openssl\\openssl.exe"
+            elif config.dist_type.startswith("bundle_linux"):
+                self.openssl_bin = "../runtime/bin/openssl"
+            else:
+                self.openssl_bin = "openssl"
 
         self.context_client = None
         self.context_server = None