WebOfTrust: Fix typo in logging
IdentityInserter: Fix ERROR 'getRequestClient() called for *insert*" '

It would complain to the log file that getRequestClient() was being
called for an insert, because I had assumed that it would only be called
for fetches.
But testing shows that the node in fact does call it for inserts, and it
makes sense: Inserts and fetches both are data transfers across the
network, and thus subject to limited bandwidth. Therefore, they both
need scheduling.

Thus, this commit removes the logging.
Also, it adds JavaDoc to WebOfTrust.getRequestClient() to document that
the client is used both for IdentityFetcher and IdentityInsert.
The same JavaDoc is added to IntroductionPuzzleStore.getRequestClient()
with regards to its users IntroductionServer / IntroductionClient.

Symptoms were:

Dec 30, 2014 06:26:12:273 (plugins.WebOfTrust.IdentityInserter, WoT
Identity Inserter(1), ERROR): getRequestClient() called for *insert*
class IdentityInserter
java.lang.RuntimeException
	at
plugins.WebOfTrust.IdentityInserter.getRequestClient(IdentityInserter.java:118)
	at
freenet.client.async.ClientRequester.<init>(ClientRequester.java:69)
	at
freenet.client.async.BaseClientPutter.<init>(BaseClientPutter.java:22)
	at freenet.client.async.ClientPutter.<init>(ClientPutter.java:111)
	at
freenet.client.HighLevelSimpleClientImpl.insert(HighLevelSimpleClientImpl.java:274)
	at
plugins.WebOfTrust.IdentityInserter.insert(IdentityInserter.java:189)
	at
plugins.WebOfTrust.IdentityInserter.iterate(IdentityInserter.java:147)
	at freenet.support.TransferThread.run(TransferThread.java:75)
	at
freenet.support.PooledExecutor$MyThread.innerRun(PooledExecutor.java:248)
	at
freenet.support.PooledExecutor$MyThread.realRun(PooledExecutor.java:188)
	at freenet.support.io.NativeThread.run(NativeThread.java:129)
Organize imports