Merge branch 'pull-request/2608'

* pull-request/2608:
  Test ldap_exop_passwd with less parameters to be sure it works
  Changed API to avoid using passing result by reference
  Removed unused variables left over by LDAP EXOP patch
  Removed TSRMLS_CC instances left over by LDAP EXOP patch
  Swapped position of retoid and retdata as retoid is almost never used
  Removed two step syntax for EXOP helpers, one call workflow is enough
  Improved ldap_exop test to encode&decode a passwd EXOP to test sending/recieving data
  Removed TODOs regarding implementing passwd and whoami exops based on ldap_exop
  Added constants for standard EXOPs
  Removed ldap_refresh function as I’m not sure how to fix/use/test it
  Fixed ldap_exop and ldap_parse_exop. Only tested them for whoami exop. (see test file)
  Fixed ldap_parse_exop_whoami and ldap_parse_exop_passwd and added test for them
  Fixed ldap_exop_whoami and added a test for it
  Fixed ldap_exop_passwd and added tests for it
  Fixed building errors in LDAP EXOP
  Added EXOP features based on patch from http://cvsweb.netbsd.org/bsdweb.cgi/pkgsrc/databases/php-ldap/files/ldap-ctrl-exop56.patch