Rename clang.modules-cache-path to symbols.clang-modules-cache-path

I want to extend the properties on ModuleList to also contain other
more general settings and renaming the settings category to symbols
seems to be the least bad of choices.

llvm-svn: 327193
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 49414cb..172cd48 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -776,8 +776,8 @@
       ConstString("platform"), ConstString("Platform settings."), true,
       Platform::GetGlobalPlatformProperties()->GetValueProperties());
   m_collection_sp->AppendProperty(
-      ConstString("clang"), ConstString("Settings specific to Clang."), true,
-      ModuleList::GetGlobalModuleListProperties().GetValueProperties());
+      ConstString("symbols"), ConstString("Symbol lookup and cache settings."),
+      true, ModuleList::GetGlobalModuleListProperties().GetValueProperties());
   if (m_command_interpreter_ap) {
     m_collection_sp->AppendProperty(
         ConstString("interpreter"),