[Filebrowser] Add get delegation token logic for secure hadoop (#3301) (Related with: #3324,#3449 )

[SoniaComp]

What changes were proposed in this pull request?

I am working on integrating Hue with SecureHadoop as a ProxyUser.
I found that the behavior of ProxyUser in WebHDFS FileBrowser needs to be enhanced.
When "security_enabled" is true, only "read_url" method use delegation token.

I want to modify the code
so that a user who has been impersonated from Hue(a proxy user) can issue a Delegation Token when using WebHDFS.
(#3323)

How was this patch tested?

Our company has been successfully using this fixed code since last year, so I'm sure that this bug fix work well.

[github-actions]

This PR is stale because it has been open 45 days with no activity and is not labeled "Prevent stale". Remove "stale" label or comment or this will be closed in 10 days.

[bjornalm]

@SoniaComp Thank you for contributing with this PR.

@agl29 Can you take a look at this? It has been pending for a while.

[github-actions]

⚠️ No test files modified. Please ensure that changes are properly tested. ⚠️

[github-actions]

UI Coverage Report

Lines	Statements	Branches	Functions
	39.15% (30527/77959)	31.01% (14247/45936)	23.89% (2130/8915)

[github-actions]

Python Coverage Report •

File	Stmts	Miss	Cover	Missing
desktop/libs/hadoop/src/hadoop/fs
webhdfs.py	665	465	30%	126, 134, 136, 144, 148, 152, 156, 160–162, 164, 166–170, 172, 182–189, 191–196, 198–199, 202, 220–221, 232, 240, 244–246, 248–251, 259–267, 275–276, 282–287, 297, 300, 307–310, 316–319, 322–325, 328, 332–334, 345–347, 349–350, 352–354, 357–360, 363–364, 372–377, 380–381, 385–386, 388, 392, 396–397, 399, 409–410, 413–419, 423–425, 433–434, 442–448, 450–452, 456–461, 463–467, 471–479, 483–488, 492–502, 504, 512–519, 521, 529–531, 534, 542–553, 556–561, 569–582, 592, 595, 598, 607–619, 627–631, 635–640, 643–648, 651–655, 658–662, 665–670, 673–677, 680–690, 692, 695, 698–704, 706, 708–709, 711–712, 714, 716–721, 728, 730–731, 733, 736–737, 739–740, 742–743, 745–749, 751, 770–771, 776–778, 780–781, 783–784, 786, 789–791, 796–798, 800, 802, 805, 810–811, 813, 820, 829–830, 832–833, 836, 838–839, 842, 845–849, 853, 855–857, 859–865, 870–871, 873–878, 889, 892–898, 902–904, 906–907, 909, 912, 914, 916–917, 931–938, 940–947, 949, 953–959, 961, 964–965, 968, 971–973, 977, 980–982, 985, 988, 997–1000, 1008–1011, 1018–1019, 1021–1022, 1025–1031, 1034–1039, 1042–1047, 1051–1055, 1057
TOTAL	54185	27078	50%

Pytest Report

Tests	Skipped	Failures	Errors	Time
1186	106 💤	0 ❌	0 🔥	6m 2s ⏱️

[SoniaComp]

@bjornalm @agl29 Hi! Could I get more feedbacks about this PR? I could develop the code than! Thank you 🙏