Add StorageTier into Tachyon
fix some typo and format
small fix for getting block size
Fixed the userId changing issue [TACHYON-171]

The problem is that if a user opens a client connection and starts
writing a file, but finishes writing after a certain
timeout (user.master.client.timeout.ms), then the MasterClient will
close its connection before the file is written, then reconnect and get
a new userId, which will screw up the write.

I'm not quite sure why we automatically close the connection if it
hasn't been used for a while, as we aren't really wasting any resources
by keeping it open. This change removes the original heartbeat
mechanism, which tracks how recently the client has been used and closes
the connection automatically, with a heartbeat that pings the master to
check the connection, and closes the client only if it can't connect to
the master. Now on a long write (or any operation with the client that
takes longer than user.master.client.timeout.ms), we won't reconnect and
change the userId.
simplify code path of converting String to enum in StorageLevelAlias
Documentation fixes
Undid the changes to MasterClient retry logic
relocate docker

Signed-off-by: rootfs <hchen@redhat.com>
add vagrant recipe to deploy tachyon cluster on virtualbox and aws

Signed-off-by: rootfs <hchen@redhat.com>
doc and check that vagrant version 1.6.5 is required
review feedback:change image name from TachyonSlave to TachyonWorker
remove unused Exceptions in WorkerStorage
review feedback: not use aws subnet_id right now

Signed-off-by: rootfs <hchen@redhat.com>
equals requires hashCode. No usage of equals could be found so removed from Pair.
UiFileInfo defined compareTo without equals and hashCode.  Since this is needed, switched over to Comparator
null checks ignored in finally block with nullable types.  added transient flag to master info
added transient flag to all servlet fields
set jetty thread count as a config
Merge pull request #489 from dcapwell/findbugscleanup

Findbugscleanup
cleared