Deadlock between auto-update recycle and initialization

[tjanczuk]

This makes the worker process unresponsive. Related to #273.

Initialization logic hold application manager lock and attempts to acquire file watcher lock:

03 00b6c640 6d0637f5 013adf10 37074d6f 013bbe28 ntdll!RtlEnterCriticalSection+0x43 [d:\win8_gdr\minkernel\ntdll\resource.c @ 1000]
04 00b6ca9c 6d0687c0 03aaac0c 03adae58 6d06132a iisnode!CFileWatcher::WatchFiles+0x2a5 [c:\projects\iisnode\src\iisnode\cfilewatcher.cpp @ 139]
05 00b6cad4 6d069b64 03b1a948 03aa9578 37074cf3 iisnode!CNodeApplication::Initialize+0x100 [c:\projects\iisnode\src\iisnode\cnodeapplication.cpp @ 49]
06 00b6cb00 6d069a7f 03aaac0c 013bbe28 03aa9578 iisnode!CNodeApplicationManager::GetOrCreateNodeApplicationCore+0xa4 [c:\projects\iisnode\src\iisnode\cnodeapplicationmanager.cpp @ 387]
07 00b6cb28 6d068d64 03aa9578 00000000 00000001 iisnode!CNodeApplicationManager::GetOrCreateNodeApplication+0x8f [c:\projects\iisnode\src\iisnode\cnodeapplicationmanager.cpp @ 660]
08 00b6cb74 6d071ac9 03aa9578 03aa9580 00b6cb94 iisnode!CNodeApplicationManager::Dispatch+0x114 [c:\projects\iisnode\src\iisnode\cnodeapplicationmanager.cpp @ 212]
09 00b6cb98 6d381bae 03aa9578 03aa9580 00a5a7c0 iisnode!CNodeHttpModule::OnExecuteRequestHandler+0x49 [c:\projects\iisnode\src\iisnode\cnodehttpmodule.cpp @ 39]

Auto-update logic holds the file watcher log and attempts to acquire the application manager lock:

00 03f1f8b0 7794e978 00568b14 00000000 01ce473a ntdll!NtWaitForAlertByThreadId+0xc [e:\obj.x86fre\minkernel\ntdll\wow6432\objfre\i386\usrstubs.asm @ 3469]
01 03f1f90c 6d06a0c5 00568b14 34407ebb 01ce473a ntdll!RtlAcquireSRWLockExclusive+0x131 [d:\win8_gdr\minkernel\ntdll\srwlock.c @ 1270]
02 03f1f948 6d06a070 013bbe78 00000001 03f1fbfc iisnode!CNodeApplicationManager::RecycleApplication+0x45 [c:\projects\iisnode\src\iisnode\cnodeapplicationmanager.cpp @ 305]
03 03f1f958 6d063093 00568b08 013bbe78 013adf00 iisnode!CNodeApplicationManager::OnScriptModified+0x10 [c:\projects\iisnode\src\iisnode\cnodeapplicationmanager.cpp @ 343]
04 03f1fbfc 6d063b1d 013307b0 00000000 34407bb3 iisnode!CFileWatcher::ScanDirectory+0x1b3 [c:\projects\iisnode\src\iisnode\cfilewatcher.cpp @ 585]
05 03f1fc40 6d07288b 013adf00 34407b8b 00000000 iisnode!CFileWatcher::Worker+0xad [c:\projects\iisnode\src\iisnode\cfilewatcher.cpp @ 516]