Resource Table locks on a static protective flag

[ctsims]

There are a few places in the code where CommCare is pretty sloppy with using static locks.

I just fixed one here:
https://github.com/dimagi/commcare-core/pull/645/files#diff-a5c25a223fdbfdb01034706e5380d1c4L29

which was preventing multiple nodeset lookups from happening simultaneously

I think it may be the case that this one:

commcare-core/src/main/java/org/commcare/resources/ResourceManager.java

Line 29 in fe3aca9

protected final static Object updateLock = new Object();

Is a huge source of "silent" concurrent locking for formplayer.

The implication of this would be that while using formplayer, only one web request would be able to be manipulating the state of an app at any time.