gh-179 fix password decryption on docker pull

[andreysaksonov]

Fix for gh-179

[davidxia]

@andreysaksonov thanks for the PR. Can @NargiT @eyeqinglan @Tzrlk test this works? If so, I'll review and merge.

[Tzrlk]

Just tested this and the issue appears to be fixed.

EDIT: Spoke too soon. After switching from 1.4.4-SNAPSHOT to 1.4.3 is continued to work, but failed when I went to 1.4.2. I then went back to 1.4.3, where it now failed, and then back to 1.4.4-SNAPSHOT where it continued to fail. I'll see if I can find out why it's giving me a BAD_CREDENTIAL error and report back.

EDIT 2: Turns out I just locked-out the account :P. Decryption works in 1.4.3 and 1.4.4-SNAPSHOT.

[jackson-chris]

Just tested these changes and they do address the problem I outlined in #204