[lldb][test] Remove symlink for API tests.

Summary: Moves lldbsuite tests to lldb/test/API.

This is a largely mechanical change, moved with the following steps:

```
rm lldb/test/API/testcases
mkdir -p lldb/test/API/{test_runner/test,tools/lldb-{server,vscode}}
mv lldb/packages/Python/lldbsuite/test/test_runner/test lldb/test/API/test_runner
for d in $(find lldb/packages/Python/lldbsuite/test/* -maxdepth 0 -type d | egrep -v "make|plugins|test_runner|tools"); do mv $d lldb/test/API; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-vscode -maxdepth 1 -mindepth 1 | grep -v ".py"); do mv $d lldb/test/API/tools/lldb-vscode; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-server -maxdepth 1 -mindepth 1 | egrep -v "gdbremote_testcase.py|lldbgdbserverutils.py|socket_packet_pump.py"); do mv $d lldb/test/API/tools/lldb-server; done
```

lldb/packages/Python/lldbsuite/__init__.py and lldb/test/API/lit.cfg.py were also updated with the new directory structure.

Reviewers: labath, JDevlieghere

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D71151

lldb/test/API/python_api/default-constructor/sb_module.py

@@ -0,0 +1,30 @@
+"""
+Fuzz tests an object after the default construction to make sure it does not crash lldb.
+"""
+
+import sys
+import lldb
+
+
+def fuzz_obj(obj):
+    obj.GetFileSpec()
+    obj.GetPlatformFileSpec()
+    obj.SetPlatformFileSpec(lldb.SBFileSpec())
+    obj.GetUUIDString()
+    obj.ResolveFileAddress(sys.maxsize)
+    obj.ResolveSymbolContextForAddress(lldb.SBAddress(), 0)
+    obj.GetDescription(lldb.SBStream())
+    obj.GetNumSymbols()
+    obj.GetSymbolAtIndex(sys.maxsize)
+    sc_list = obj.FindFunctions("my_func")
+    sc_list = obj.FindFunctions("my_func", lldb.eFunctionNameTypeAny)
+    obj.FindGlobalVariables(lldb.SBTarget(), "my_global_var", 1)
+    for section in obj.section_iter():
+        s = str(section)
+    for symbol in obj.symbol_in_section_iter(lldb.SBSection()):
+        s = str(symbol)
+    for symbol in obj:
+        s = str(symbol)
+    obj.GetAddressByteSize()
+    obj.GetByteOrder()
+    obj.GetTriple()