rhuimanager_repo.py: increased timeout when adding a new RH content repo

Sometimes it is not enough time to load entitled RH products
Changed generic name of the directory /root/rpms to a specific one

Name of this directocy was changed in order to avvoid confusion in
the future. Name of the direcoty will be /root/rpms+number testcase
test_rhui_tcms324680.py fixed name of the repo
test_rhui_tcms69086.py: wait until cds will be synced

Triggering syncronization is not enough as it could be that cds
sync will not be comleted and meanwhile other operations depending
on it could start.
added _sync_wait_cds function

this function will be waiting for the cds syncronization, and only
after completion of this task other operations will follow.
updated testcases where cluster is synced with sync_wait_cds function

After  cluster sync was triggered we should wait for all cdses synced
till the end before doing other operations.
test_rhui_tcms178468.py: changed to  wait until cds will be synced
Merge branch 'master' of github.com:RedHatQE/rhui-testing-tools