otest-query: when we dlopen, use RTLD_LAZY instead of RTLD_NOW.
otest-query: when we dlopen, use RTLD_LAZY instead of RTLD_NOW.

Summary:
This fixes an issue I'm seeing... where a framework referenced by my
tests actually references a symbol that does not exist.

Because of this, I'm getting ...

```
Failed to query the list of test cases in the test bundle:
dlopen(/var/folders/v2/b9w9xt6j1n79c8qjxhkvftmc000xbj/T/build-outputYYP4rr/Products/Debug/IntegrationTests.xctest/Contents/MacOS/IntegrationTests, 2): Symbol not found: _SecCertificateGetSHA1Digest
  Referenced from: /Applications/xcode_5.1.app/Contents/Developer/../SharedFrameworks/DVTFoundation.framework/Versions/A/DVTFoundation
  Expected in: /System/Library/Frameworks/Security.framework/Versions/A/Security
 in /Applications/xcode_5.1.app/Contents/Developer/../SharedFrameworks/DVTFoundation.framework/Versions/A/DVTFoundation
```

In the above case, DVTFoundation references `SecCertificateGetSHA1Digest`, and
that symbol is supposed to be in Security.framework, but it's not (at
least on OS X 10.8)

By switching to RTLD_LAZY, dyld won't bother binding every single
function, and we'll never encounter the error.

There shouldn't be any negative consequences by this change - we're just
delaying the binding.  In fact, I wonder if it'll make otest-query a
little faster since we'll skip binding.

From the dyld man page --
```
   RTLD_LAZY   Each external function reference is bound the first time the
               function is called.

   RTLD_NOW    All external function references are bound immediately during
               the call to dlopen().
```

Test Plan:
With this patch, I ran xctool against my project and it now works.

blighli/xctool,SuPair/xctool,kamoljan/xctool,adamjernst/xctool,Richardlihui/xctool,leopardpan/xctool,Monits/xctool,kernandreas/xctool,SuPair/xctool,n054/xctool,bhamiltoncx/xctool,FiftyThree/xctool,facebook/xctool,bgertzfield/xctool,1yvT0s/xctool,PSPDFKit-labs/xctool,leopardpan/xctool,soundcloud/xctool,lpios/xctool,n054/xctool,AutoScout24/xctool,SuPair/xctool,blighli/xctool,lpios/xctool,LegNeato/xctool,bhamiltoncx/xctool,bhamiltoncx/xctool,facebook/xctool,LegNeato/xctool,agreco/xctool,bgertzfield/xctool,ekingo/xctool,dvor/xctool,jspahrsummers/xctool,kamoljan/xctool,ACChe/xctool,githubdelegate/xctool,PSPDFKit-labs/xctool,kamoljan/xctool,adamjernst/xctool,ACChe/xctool,trello/xctool,githubdelegate/xctool,duk42111/xctool,AutoScout24/xctool,PSPDFKit-labs/xctool,FiftyThree/xctool,SuPair/xctool,n054/xctool,jspahrsummers/xctool,lpios/xctool,bgertzfield/xctool,modulexcite/xctool,facebook/xctool,theiren46/xctool,ekingo/xctool,ACChe/xctool,blighli/xctool,leopardpan/xctool,kamoljan/xctool,modulexcite/xctool,Monits/xctool,ACChe/xctool,githubdelegate/xctool,soundcloud/xctool,ekingo/xctool,dvor/xctool,yaoxiaoyong/xctool,FiftyThree/xctool,modulexcite/xctool,theiren46/xctool,theiren46/xctool,facebook/xctool,duk42111/xctool,blighli/xctool,kernandreas/xctool,1yvT0s/xctool,adamjernst/xctool,AutoScout24/xctool,FiftyThree/xctool,agreco/xctool,githubdelegate/xctool,trello/xctool,Richardlihui/xctool,soundcloud/xctool,ACChe/xctool,trello/xctool,yaoxiaoyong/xctool,agreco/xctool,theiren46/xctool,PSPDFKit-labs/xctool,dvor/xctool,PSPDFKit-labs/xctool,LegNeato/xctool,yaoxiaoyong/xctool,duk42111/xctool,jspahrsummers/xctool,bhamiltoncx/xctool,n054/xctool,trello/xctool,bhamiltoncx/xctool,bgertzfield/xctool,soundcloud/xctool,Richardlihui/xctool,1yvT0s/xctool,lpios/xctool,LegNeato/xctool,yaoxiaoyong/xctool,duk42111/xctool,Monits/xctool,facebook/xctool,AutoScout24/xctool,kernandreas/xctool,n054/xctool,leopardpan/xctool,modulexcite/xctool,bgertzfield/xctool,Richardlihui/xctool,jspahrsummers/xctool,bgertzfield/xctool,kernandreas/xctool,lpios/xctool,soundcloud/xctool,bhamiltoncx/xctool,Monits/xctool,soundcloud/xctool,ACChe/xctool,facebook/xctool,adamjernst/xctool,ekingo/xctool,dvor/xctool,lpios/xctool,n054/xctool,1yvT0s/xctool,agreco/xctool