travis: use https based maven repo mirror

[yadvr]

Travis has been failing lately as it requires that repositories use
https:// URLs.

Reference:
https://blog.sonatype.com/central-repository-moving-to-https

Without this fix all PRs are blocked from testing for 4.11+ branches.

[yadvr]

This will be forward merged to master/4.14 and then re-kick all Travis builds for PRs which are failing.

[DaanHoogland]

mvn says so so let's comply

[weizhouapache]

ohohoh, that's why many travis tests failed

[sateesh-chodapuneedi]

LGTM

[yadvr]

I'll merge this, there seems to be an issue with ipmisim that's separate from this issue. (will check that ipmisim issue tomorrow, but merge this so all PRs are unblocked).

[yadvr]

cc @DaanHoogland @andrijapanicsb
Post merging, the ipmisim issue happened to due change in the dependency library pyghmi. To fix that I did a new release of ipmisim with a fixed pyghmi version: https://github.com/rhtyd/ipmisim
And uploaded the new ipmisim artifact here: https://pypi.org/project/ipmisim/0.8/

On Travis the oobm tests are failing, but likely due to Travis caching issue. I've tried to delete Travis caches, hopefully it will pass in the next run(s). Locally the tests are passing now the new ipmisim lib that gets installed via Marvin library against master/4.14:

=== TestName: test_oobm_background_powerstate_sync | Status : SUCCESS ===
ok
Tests out-of-band management configuration with valid data ... === TestName: test_oobm_configure_default_driver | Status : SUCCESS ===
ok
Tests out-of-band management configuration with invalid driver ... === TestName: test_oobm_configure_invalid_driver | Status : SUCCESS ===
ok
Tests out-of-band management host disable feature with ... === TestName: test_oobm_disable_feature_invalid | Status : SUCCESS ===
ok
Tests out-of-band management host disable feature with ... === TestName: test_oobm_disable_feature_valid | Status : SUCCESS ===
ok
Tests out-of-band management host enable feature with ... === TestName: test_oobm_enable_feature_invalid | Status : SUCCESS ===
ok
Tests out-of-band management host enable feature with ... === TestName: test_oobm_enable_feature_valid | Status : SUCCESS ===
ok
Tests out-of-band management enable/disable feature at cluster ... === TestName: test_oobm_enabledisable_across_clusterzones | Status : SUCCESS ===
ok
Tests out-of-band management issue power cycle action ... === TestName: test_oobm_issue_power_cycle | Status : SUCCESS ===
ok
Tests out-of-band management issue power off action ... === TestName: test_oobm_issue_power_off | Status : SUCCESS ===
ok
Tests out-of-band management issue power on action ... === TestName: test_oobm_issue_power_on | Status : SUCCESS ===
ok
Tests out-of-band management issue power reset action ... === TestName: test_oobm_issue_power_reset | Status : SUCCESS ===
ok
Tests out-of-band management issue power soft action ... === TestName: test_oobm_issue_power_soft | Status : SUCCESS ===
ok
Tests out-of-band management issue power action ... === TestName: test_oobm_issue_power_status | Status : SUCCESS ===
ok
Tests out-of-band management ownership expiry across multi-mgmt server ... === TestName: test_oobm_multiple_mgmt_server_ownership | Status : SUCCESS ===
ok
Tests out-of-band management change password feature ... === TestName: test_oobm_zchange_password | Status : SUCCESS ===
ok

----------------------------------------------------------------------
Ran 16 tests in 66.747s

OK

[yadvr]

Confirmed fix, job3 passed for the rekicked Travis job:
https://travis-ci.org/apache/cloudstack/jobs/643301749