Description of problem: Pagination Size under Customization in IPA WebUI
accepts negative value -1


Version-Release number of selected component (if applicable):
ipa-server-4.5.0-9.el7.x86_64

How reproducible: Always

Steps to Reproduce:
1. Install IPA-Server
2. Login to web UI as admin | Navigate to Administrator on RHS corner.
3. Select Customization from the drop down.
4. In the Pagination size text box enter -1 as value.

Actual results:
1. -1 value is accepted in the Pagination size text box and when save button is
clicked, Working icon is shown which doesn't finish, with the url address
switching back and forth as

https://qe-blade-08.testrelm.test/ipa/ui/#/e/user/search//page=-1
https://qe-blade-08.testrelm.test/ipa/ui/#/e/user/search//page=1

2. Also the http error_log is being appended with the error message

[root@qe-blade-08 ~]# du -sh /var/log/httpd/error_log
568K    /var/log/httpd/error_log

[root@qe-blade-08 ~]# du -sh /var/log/httpd/error_log
1.5M    /var/log/httpd/error_log


[Thu May 18 06:15:35.270547 2017] [:warn] [pid 6575] [client
10.76.33.216:39108] failed to set perms (3140) on file
(/var/run/ipa/ccaches/admin@TESTRELM.TEST)!, referer:
https://qe-blade-08.testrelm.test/ipa/ui/
[Thu May 18 06:15:35.321164 2017] [:error] [pid 6570] ipa: INFO:
[jsonserver_session] admin@TESTRELM.TEST: user_find(u'', sizelimit=0,
version=u'2.224', pkey_only=True): SUCCESS
[Thu May 18 06:15:35.572341 2017] [:warn] [pid 6575] [client
10.76.33.216:39108] failed to set perms (3140) on file
(/var/run/ipa/ccaches/admin@TESTRELM.TEST)!, referer:
https://qe-blade-08.testrelm.test/ipa/ui/
[Thu May 18 06:15:35.627594 2017] [:error] [pid 6571] ipa: INFO:
[jsonserver_session] admin@TESTRELM.TEST: user_find(u'', sizelimit=0,
version=u'2.224', pkey_only=True): SUCCESS
[Thu May 18 06:15:35.880066 2017] [:warn] [pid 6575] [client
10.76.33.216:39108] failed to set perms (3140) on file
(/var/run/ipa/ccaches/admin@TESTRELM.TEST)!, referer:
https://qe-blade-08.testrelm.test/ipa/ui/

3. All the tabs in the UI is affected, i.e data is not displayed, which is
correct behaviour since no positive value is specified, once a positive value
is given the entries are displayed.

Expected results:
Pagination size should not accept negative values which is causing issues with
IPA Web UI.

Additional info: