Description of problem:

Typo in XmlCpuSpeed class (bkr.server.needpropertyxml):

value = self.get_xml_attr('value', int, None)

where 'int' should be float.

mysql> describe cpu speed;
+-------+-------+------+-----+---------+-------+
| Field | Type  | Null | Key | Default | Extra |
+-------+-------+------+-----+---------+-------+
| speed | float | YES  |     | NULL    |       |
+-------+-------+------+-----+---------+-------+

Traceback while using float value in cpu speed filtering:

Traceback (most recent call last):
  File "/root/devel/beaker/IntegrationTests/src/bkr/inttest/server/test_model.py", line 53, in test_cpu_speed
    """))
  File "/root/devel/beaker/Server/bkr/server/model.py", line 3056, in systems_filter
    systems = apply_system_filter(filter, systems)
  File "/root/devel/beaker/Server/bkr/server/needpropertyxml.py", line 907, in apply_system_filter
    (query, clause) = child.filter(query)
  File "/root/devel/beaker/Server/bkr/server/needpropertyxml.py", line 105, in filter
    (joins, query) = child.filter(joins)
  File "/root/devel/beaker/Server/bkr/server/needpropertyxml.py", line 667, in filter
    value = self.get_xml_attr('value', int, None)
  File "/root/devel/beaker/Server/bkr/server/needpropertyxml.py", line 81, in get_xml_attr
    return typeCast(attributes[attr])
ValueError: invalid literal for int() with base 10: '1500.0'



Version-Release number of selected component (if applicable):
beaker-0.10

How reproducible:
100%

Steps to Reproduce:
1. submit a job with float value of cpu speed in hostRequires, like
    <hostRequires>
        <cpu>
            <speed value="1500.0"/>
        </cpu>
    </hostRequires>


  
Actual results:

error message:

Failed to import job because of: "Error in hostRequires: invalid literal for int() with base 10: '1500.0'"

Expected results:
float value in cpu speed filtering should work.

Additional info: