NAMECHEAP: Fix integration tests

[tlimoncelli]

As reported in #3311 (comment) ... here are 5 integration tests that are failing.

--- FAIL: TestDNSProviders/willpower232testsdnscontrol.com/06:MX:Change_MX_p (0.95s)
--- FAIL: TestDNSProviders/willpower232testsdnscontrol.com/22:complex_TXT:a_0-byte_TXT (0.75s)
--- FAIL: TestDNSProviders/willpower232testsdnscontrol.com/33:CAA:CAA_change_flag (0.89s)
--- FAIL: TestDNSProviders/willpower232testsdnscontrol.com/76:IGNORE_with_modify:VERIFY_PREVIOUS (0.46s)
--- FAIL: TestDNSProviders/willpower232testsdnscontrol.com/79:IGNORE_w/change_b3227:VERIFY_PREVIOUS#02 (0.30s)

@willpower232

[willpower232]

I think the Change MX P is #2277

I will investigate your fix as per #3311 (comment) and see what information I can gather about the others

[tlimoncelli]

Thanks!