compilation error symbol SFTP_COMMAND_MKDIR

[maltris]

Hello,

it seems this commit (https://github.com/yciabaud/jmeter-ssh-sampler/commit/3521fb31ab65ff9cc4810e5607686c2413d2b7e4) introduced a problem in the compilation:

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/usr/git/jmeter-ssh-sampler/src/main/java/org/apache/jmeter/protocol/ssh/sampler/SSHSFTPSampler.java:[159,20] cannot find symbol
  symbol:   variable SFTP_COMMAND_MKDIR
  location: class org.apache.jmeter.protocol.ssh.sampler.SSHSFTPSampler
[ERROR] /home/usr/git/jmeter-ssh-sampler/src/main/java/org/apache/jmeter/protocol/ssh/sampler/SSHSFTPSamplerBeanInfo.java:[45,27] cannot find symbol
  symbol:   variable SFTP_COMMAND_MKDIR
  location: class org.apache.jmeter.protocol.ssh.sampler.SSHSFTPSampler

I reverted that commit locally and the build succeeds.