Addresses #2164 refs[t:2164] Take brtheader lock when accessing zombie/live lists during fdelete on commit.

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only way for that to be open is if it was deleted, and checkpoint holds it open (which is not an issue to prevent rename).

Also, when renamed, the list of zombie dbs is updated with the new dname.

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We run 'backward' recovery and 'forward recovery' on the item we turn around on, so do not set 'forward saw checkpoint begin' state
till we're in forward recovery.

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Added missing state transaction (turn around on checkpoint begin with no transactions)
Added error checking for unlink (anything but 0/ENOENT is real error)

Changes due to code review with Barry

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 * Before 'checkpoint begin'
  * fcreate
   * Will not create (treated as fopen)
   * Will not delete file
   * Will force rollback entry of fcreate (if file exists)
 * After checkpoint begin
  * fcreate
   * Will create
   * Will first delete file
   * Will force rollback entry of fcreate (if file exists)



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Closes #2180 closes[t:2180] Recovery forces 'fcreate' in rollback log (when replaying fcreate log entry)

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Addresses #652, #2170, #2178 refs[t:652,2170,2178] Merge from 3.0.0-logging branch with command: svn merge -r15784:HEAD https://svn.tokutek.com/tokudb/mysql.branches/3.0.0-logging/tokudb .

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Was not holding cachetable lock to access rwlock (whose mutex was cachetable lock).
This caused a race condition that you would sometimes grab the cachetable lock on exiting the lock but didn't have it before.

We believe this caused the deadlock

git-svn-id: file:///svn/toku/tokudb@15802 c7de825b-a66e-492c-adef-691d508d4ae1

Closes #2171 refs[t:2171] Add version info to persistent environment, create hook for environment update.

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i.e. only queries

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Checkpoint holds entire brt open (as zombie if necessary) instead of just holding open the cachefile.

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fopen forward recovery: file missing (ENOENT) is not considered an error.

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Closes #2153 refs[t:2153] fopen logged only once (unless closed and reopened).  Removed logger from cachefile_close,
removed txnid from logging of fopen.

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Addresses #2120 refs[t:2120] Internally created child transactions now copy parent's isolation level

git-svn-id: file:///svn/toku/tokudb.2037b@15675 c7de825b-a66e-492c-adef-691d508d4ae1

Ydb lock was not being grabbed due to confusion with conditional compiling.
YDB lock is now taken/released if the fair scheduling code is not active

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